diff --git a/compute-accuracy.c b/compute-accuracy.c
new file mode 100644
index 0000000..27bc4a4
--- /dev/null
+++ b/compute-accuracy.c
@@ -0,0 +1,137 @@
+//  Copyright 2013 Google Inc. All Rights Reserved.
+//
+//  Licensed under the Apache License, Version 2.0 (the "License");
+//  you may not use this file except in compliance with the License.
+//  You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+//  Unless required by applicable law or agreed to in writing, software
+//  distributed under the License is distributed on an "AS IS" BASIS,
+//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//  See the License for the specific language governing permissions and
+//  limitations under the License.
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+#include <malloc.h>
+#include <ctype.h>
+
+const long long max_size = 2000;         // max length of strings
+const long long N = 1;                   // number of closest words
+const long long max_w = 50;              // max length of vocabulary entries
+
+int main(int argc, char **argv)
+{
+  FILE *f;
+  char st1[max_size], st2[max_size], st3[max_size], st4[max_size], bestw[N][max_size], file_name[max_size], ch;
+  float dist, len, bestd[N], vec[max_size];
+  long long words, size, a, b, c, d, b1, b2, b3, threshold = 0;
+  float *M;
+  char *vocab;
+  int TCN, CCN = 0, TACN = 0, CACN = 0, SECN = 0, SYCN = 0, SEAC = 0, SYAC = 0, QID = 0, TQ = 0, TQS = 0;
+  if (argc < 2) {
+    printf("Usage: ./compute-accuracy <FILE> <threshold>\nwhere FILE contains word projections, and threshold is used to reduce vocabulary of the model for fast approximate evaluation (0 = off, otherwise typical value is 30000)\n");
+    return 0;
+  }
+  strcpy(file_name, argv[1]);
+  if (argc > 2) threshold = atoi(argv[2]);
+  f = fopen(file_name, "rb");
+  if (f == NULL) {
+    printf("Input file not found\n");
+    return -1;
+  }
+  fscanf(f, "%lld", &words);
+  if (threshold) if (words > threshold) words = threshold;
+  fscanf(f, "%lld", &size);
+  vocab = (char *)malloc(words * max_w * sizeof(char));
+  M = (float *)malloc(words * size * sizeof(float));
+  if (M == NULL) {
+    printf("Cannot allocate memory: %lld MB\n", words * size * sizeof(float) / 1048576);
+    return -1;
+  }
+  for (b = 0; b < words; b++) {
+    fscanf(f, "%s%c", &vocab[b * max_w], &ch);
+    for (a = 0; a < max_w; a++) vocab[b * max_w + a] = toupper(vocab[b * max_w + a]);
+    for (a = 0; a < size; a++) fread(&M[a + b * size], sizeof(float), 1, f);
+    len = 0;
+    for (a = 0; a < size; a++) len += M[a + b * size] * M[a + b * size];
+    len = sqrt(len);
+    for (a = 0; a < size; a++) M[a + b * size] /= len;
+  }
+  fclose(f);
+  TCN = 0;
+  while (1) {
+    for (a = 0; a < N; a++) bestd[a] = 0;
+    for (a = 0; a < N; a++) bestw[a][0] = 0;
+    scanf("%s", st1);
+    for (a = 0; a < strlen(st1); a++) st1[a] = toupper(st1[a]);
+    if ((!strcmp(st1, ":")) || (!strcmp(st1, "EXIT")) || feof(stdin)) {
+      if (TCN == 0) TCN = 1;
+      if (QID != 0) {
+        printf("ACCURACY TOP1: %.2f %%  (%d / %d)\n", CCN / (float)TCN * 100, CCN, TCN);
+        printf("Total accuracy: %.2f %%   Semantic accuracy: %.2f %%   Syntactic accuracy: %.2f %% \n", CACN / (float)TACN * 100, SEAC / (float)SECN * 100, SYAC / (float)SYCN * 100);
+      }
+      QID++;
+      scanf("%s", st1);
+      if (feof(stdin)) break;
+      printf("%s:\n", st1);
+      TCN = 0;
+      CCN = 0;
+      continue;
+    }
+    if (!strcmp(st1, "EXIT")) break;
+    scanf("%s", st2);
+    for (a = 0; a < strlen(st2); a++) st2[a] = toupper(st2[a]);
+    scanf("%s", st3);
+    for (a = 0; a<strlen(st3); a++) st3[a] = toupper(st3[a]);
+    scanf("%s", st4);
+    for (a = 0; a < strlen(st4); a++) st4[a] = toupper(st4[a]);
+    for (b = 0; b < words; b++) if (!strcmp(&vocab[b * max_w], st1)) break;
+    b1 = b;
+    for (b = 0; b < words; b++) if (!strcmp(&vocab[b * max_w], st2)) break;
+    b2 = b;
+    for (b = 0; b < words; b++) if (!strcmp(&vocab[b * max_w], st3)) break;
+    b3 = b;
+    for (a = 0; a < N; a++) bestd[a] = 0;
+    for (a = 0; a < N; a++) bestw[a][0] = 0;
+    for (a = 0; a < size; a++) vec[a] = (M[a + b2 * size] - M[a + b1 * size]) + M[a + b3 * size];
+    TQ++;
+    if (b1 == words) continue;
+    if (b2 == words) continue;
+    if (b3 == words) continue;
+    for (b = 0; b < words; b++) if (!strcmp(&vocab[b * max_w], st4)) break;
+    if (b == words) continue;
+    TQS++;
+    for (c = 0; c < words; c++) {
+      if (c == b1) continue;
+      if (c == b2) continue;
+      if (c == b3) continue;
+      dist = 0;
+      for (a = 0; a < size; a++) dist += vec[a] * M[a + c * size];
+      for (a = 0; a < N; a++) {
+        if (dist > bestd[a]) {
+          for (d = N - 1; d > a; d--) {
+            bestd[d] = bestd[d - 1];
+            strcpy(bestw[d], bestw[d - 1]);
+          }
+          bestd[a] = dist;
+          strcpy(bestw[a], &vocab[c * max_w]);
+          break;
+        }
+      }
+    }
+    if (!strcmp(st4, bestw[0])) {
+      CCN++;
+      CACN++;
+      if (QID <= 5) SEAC++; else SYAC++;
+    }
+    if (QID <= 5) SECN++; else SYCN++;
+    TCN++;
+    TACN++;
+  }
+  printf("Questions seen / total: %d %d   %.2f %% \n", TQS, TQ, TQS/(float)TQ*100);
+  return 0;
+}