#include <iostream>
using namespace std;
int main() {
    int num_cut, num_dragon_heads, num_regener, k = 0, current_dragon_heads;
    cin >> num_cut >> num_dragon_heads >> num_regener;
    current_dragon_heads = num_dragon_heads;
    if (num_dragon_heads > num_cut && num_regener > num_cut)
        cout << "NO";
    else {
        while (current_dragon_heads > 0) {
            current_dragon_heads -= num_cut;
            k++;
            if (current_dragon_heads > 0)
                current_dragon_heads += num_regener;
        }
        cout << k;
    }
    return 0;
}