#include <iostream>
#include <cstdio>
#include <cstring>
using namespace std;
int main() {
int a, b, c;
while (~scanf("%d%d%d", &a, &b, &c) && a != 0 && b != 0 && c != 0) {
double ans;
ans = (double)a / (double)b;
char a[100];
sprintf(a, "%llf", ans);
int cnt = 10000;
for (int i = 0; cnt != 0; i++, cnt--) {
if (a[i] == '.') {
cnt = c + 1;
}
if (cnt == 1) {
if ((a[i + 1] - '0') >= 5)
printf("%d", a[i] - '0' + 1);
}
else
printf("%c", a[i]);
}
}
}
