#include <bits/stdc++.h>

#define int long long
using namespace std;

const int N = 1e5 + 5, mod = 1e9 + 7;

vector<int> a;

int solve(int i, int val) {
    if (i == 3)
        return val < 0 ? 1e9 : val;
    int ans = 1e9;
    ans = min(ans, solve(i + 1, val * a[i]));
    ans = min(ans, solve(i + 1, val + a[i]));
    ans = min(ans, solve(i + 1 , val - a[i]));

    if (val % a[i] == 0) {
        ans = min(ans, solve(i + 1, val / a[i]));
    }
    return ans;
}

void setAnswer(int Case) {
    a.resize(3);
    cin >> a[0] >> a[1] >> a[2];
    cout << solve(1,a[0]);
}

signed main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int testCases = 1;
//    cin >> testCases;
    for (int i = 1; i <= testCases; i++) {
        setAnswer(i);
    }
    return 0;
}