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

#define ll long long 
#define lll __int128
#define INF 0x3f3f3f3f
#define LNF 0x3f3f3f3f3f3f3f3fll
#define MOD 998244353
#define pii pair<int, int>

#define N (1<<21) 

ll gcd(ll a, ll b) {
    return b==0 ? a : gcd(b, a%b);
}

int main() {
#ifdef TEST
    freopen("zz.in", "r+", stdin);
#endif
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);


    ll h, m, a; cin >> h >> m >> a;

    if (h*m%2==0 && a==h*m/2) {
        cout << h*m << '\n';
    } else {
        ll g = gcd(h*m, h-1);
        cout << g*(2*a/g + 1);
    }

}