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