#include <iostream>
using namespace std;

int main()
{
	int m, t, s, cur = 0;
	cin >> m >> t >> s;
	if (t == 0)
	{
		cout << 0 << endl;
		return 0;
	}
	for (int i = 1; i <= s; ++i)
	{
		++cur;
		if (cur == t && m != 0)
		{
			cur = 0;
			m--;
		}
	}
	cout << m << endl;
	return 0;
}