HlebTask2

include <iostream>
using namespace std;

int calculate(int a, int b, int h) {
    int currentH;
    int days=0;
    while(currentH < h){
        currentH = currentH + a - b;
        days++;
    }
    return days;
}

int main(){
    int a, b, h;
    cin >>  a;
    cin >> b;
    cin >> h;
    cout << calculate(a, b, h);

    return 0;

}