#include<bits/stdc++.h>
using namespace std;

int a(int m, int n, int h) {
int q = 0;
int f = 0;

while (f < h) {
    q++;
    f += m;
    if (f >= h) {
        break;
    }
    f -= n;
}

return q;
}

int main() {
int m, n, h;
cin >> m >> n >> h;

int d = a(m, n, h);
cout << d;

return 0;
}