#include <cstdio>

int main(){
    int a,b,n;
    double  x;
    scanf("%d %d %d",&a,&b,&n);
    x = (double)a/b;
    for(int i = 0;i < n;i++){
        x = x*10;
    }
    printf("%d",(int)x%10);
    return 0;
}