On my computer program works correclty, but I had three CE to #1053
problem.Quastion is a word - "why":-(( ?
 I supposed problem in <math.h> or <stdlib.h> file.

Program COD::
#include <stdio.h>
#include <math.h>
#include <stdlib.h>

int NOD(int i1,int i2){
  if(i1==i2)return i1;
  int del=1,c1,c2;
  while(1){
    c1=i1; c2=i2;
    if(fmod(c1,del)!=0)break;
    if(fmod(c2,del)!=0)break;
      del++;
  };
  del--;
  return del;
};

void main(){
  int mas[999];
  int q1;
  scanf("%i",&q1);
  for(int i=0;i<q1;i++){
    scanf("%i",&mas[i]);
    if(mas[i]==1){ printf("%i",1); exit(1); }
  }
  q1=1;
  while(mas[q1]!=0){
    mas[0]=NOD(mas[0],mas[q1]); q1++;
    if(mas[0]==1){ printf("%i",1); exit(1); }
  }
  printf("%i",mas[0]);
};