//
// Created by 35395 on 2024/10/30.
//
#include<bits/stdc++.h>
#define int register long long
using namespace std;

void solve() {
    int h,m,a;
    cin >> h >> m >> a;
    int ans = 0;
    int x = h * m + m - 1 - a;
    int y = h * m - a;
    int z = (h-1) * m;
    int p = m - a - 1;
    for(int r=0;r<m;r++){
        int down = ((h - 1) * r + p) / m, up = ((h-1) * r + a) / m;
        down = max(0ll,down), up = min(h-1,up);
        ans += up - down + 1;
        if((h-1) * r + y <= z){
            ans += (h - 1) - ((h-1) * r + x) / m + 1;
        }
        if((h-1) * r - y >= 0){
            ans += ((h-1) * r - y) / m + 1;
        }
    }
    cout << ans << '\n';
}

signed main() {
    ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    int test = 1;
//    cin >> test;
    while (test--) {
        solve();
    }
    return 0;
}