#include<cstdio>
#include<cctype>
#include<string.h>
#include<math.h>
#include<cmath>
#include<algorithm>
using namespace std;
int main()
{
	double a,b;
	int n;
	cin>>a>>b>>n; 
	double bl=a*n;
	int ans=bl/b;
	cout<<ans;
	return 0;
}