#include<iostream>
#include<algorithm>
using namespace std;


long long A, B, T;

void read() {
    cin >> A >> B >> T;
}


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

long long lcm(long long a, long long b) {
    return a / gcd(a, b) * b;
}


void work() {
    long long t = T % lcm(A, B);
    
    long long minV = 1LL << 60;
    for (int nB = (t + B - 1) / B; nB >= 0; --nB) {
        int remainT = t - nB * B;
        int nA = max(0LL, remainT + A - 1) / A;
        minV = min(minV, nA * A + nB * B);
    }
    
    cout << minV + (T - t) << endl;
}


int main() {
    read();
    work();
    return 0;
}