C

#include<stdio.h>

int main()
{
    long long c,b,s;
    scanf("%lld %lld %lld", &c,&b,&s);

    if(c%b==0) printf("0\n");
    else{
      c=c%b;
      if(c%s==0) printf("1\n");
      else printf("-1\n");
    }

    return 0;
}