#include<stdio.h>
int main()
{
    int a,b,n;
    int i,r;
    scanf("%d %d %d",&a,&b,&n);
    for(i=1;i<=n;i++){
        a*=10;
        r=a/b;
        a%=b;
    }
    printf("%d\n",r);
    return 0;
    
}

错误原因是wrong answer On line 1 column 1, read 1, expected 0.