#include<bits/stdc++.h>
using namespace std;
``
int main()
{
    int m, t, s, rest=0;
	cin >> m >> t >> s;
	if (t == 0)
	{
		cout << "0" << endl;
		return 0;
	}
	int zg = 0;
	if (t != 0)
	{
		 zg= floor((double)(s / t));
		 rest = m - zg;
		 cout << rest;
		 return 0;
	}
	

	return 0;
}