文件目录

#include <iostream>
#include <cmath>
using namespace std;
int main()
{
    int n, x, y;
    cin >> n >> x >> y;
    if (y % x == 0)
        n -= y / x;
    else
        n -= y / x + 1;
    if (n < 0)
        cout << 0;
    else
        cout << n;
    return 0;
}