#include<bits/stdc++.h>
using namespace std;
int main()
{
int a, b, c;
cin >> a >> b >> c;
int x = a, y = b;
int z = x / y;
printf("%d.", z);
for (int i = 1; i <= c; i++)
{
x = x % y;
x = x * 10;
z = x / y;
if (i < c) printf("%d", z );
else
{
x = x % y;
x = x * 10;
int z2 = x / y;
if(z2>=5) printf("%d", z+1);
else printf("%d", z );
}
}
return 0;
}