#include <iostream>
#include <string>
#include <cstring>
#include <cstdlib>
#include <cmath>
#include <algorithm>
#include <vector>
#include <set>
#include <map>
#include <queue>
#include <stack>
#include <list>
#include <iterator>
#include <cassert>
#include <numeric>
#include <functional>
#include <ctime>
#pragma warning(disable:4996) 

//#define ATCODER
#ifdef ATCODER
#include <atcoder/all>
#endif

typedef long long ll;
typedef unsigned long long ull;
#define LINF  9223300000000000000
#define LINF2 1223300000000000000
#define LINF3 1000000000000
#define INF 2140000000
//const long long MOD = 1000000007;
const long long MOD = 998244353;

using namespace std;
#ifdef ATCODER
using namespace atcoder;
#endif


void solve()
{
    int a, b, c;
    scanf("%d%d%d", &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) {
            printf("INF\n"); return;
        }
        ans += v[i];
    }
    printf("%d\n", ans);
    return;
}

int main()
{
#if 1
    solve();
#else
    int T, t;
    cin >> T;
    for (t = 0; t < T; t++) {
        //cout << "Case #" << t + 1 << ": ";
        solve();
    }
#endif
    return 0;
}