#include <iostream>
#include <algorithm>
#include <vector>

#define INF 2140000000
using namespace std;

void solve()
{
    int a, b, c;
    cin >> a >> b >> c;
    vector<int> v(c, INF);
    int i, j;
    for (i = 0; i < c; i++) {
        for (j = 0; j < c; j++) {
            int tmp = i * a + j * b;
            v[tmp%c] = min(v[tmp%c], tmp/c);
        }
    }
    int ans = 0;
    for (i = 0; i < c; i++) {
        if (v[i] == INF) {
            cout<<"INF\n"; return;
        }
        ans += v[i];
    }
    cout << ans << "\n";
    return;
}

int main()
{
    solve();
    return 0;
}