/// Msaa el 5ra
#pragma GCC optimize("O3")
#pragma GCC optimize ("unroll-loops")
#pragma GCC target("avx,avx2,fma")

#include "bits/stdc++.h"

using namespace std;

#define pb push_back
#define F first
#define S second
#define f(i, a, b)  for(int i = a; i < b; i++)
#define all(a)  a.begin(),a.end()
#define rall(a) a.rbegin(),a.rend()
#define sz(x) (int)(x).size()
#define mp(x, y) make_pair(x,y)
#define popCnt(x) (__builtin_popcountll(x))
#define int ll

using ll = long long;
using ii = pair<int, int>;
using ull = unsigned long long;

const int N = 5e5 + 5, LG = 18, MOD = 1e9 + 7;
const long double PI = acos(-1);
const long double EPS = 1e-7;
int n, m;
int go[1005];
int ans[105];

void doWork() {
    int a, b, c;
    cin >> a >> b >> c;
    vector<int> vec;
    vec.push_back(a + b + c);
    vec.push_back(a + b - c);
    vec.push_back((a + b) * c);
    if ((a + b) % c == 0)
        vec.push_back((a + b) / c);
    vec.push_back(a - b + c);
    vec.push_back(a - b - c);
    vec.push_back((a - b) * c);
    if ((a - b) % c == 0)
        vec.push_back((a - b) / c);
    vec.push_back(a * b + c);
    vec.push_back(a * b - c);
    vec.push_back((a * b) * c);
    if ((a * b) % c == 0)
        vec.push_back((a * b) / c);
    if (a % b == 0) {
        vec.push_back(a / b + c);
        vec.push_back(a / b - c);
        vec.push_back(a / b * c);
        if ((a / b) % c == 0)vec.push_back(a / b / c);
    }
    sort(all(vec));
    for (auto x: vec) {
        if (x >= 0) {
            cout << x << '\n';
            return;
        }
    }
}

int32_t main() {
#ifdef ONLINE_JUDGE
    ios_base::sync_with_stdio(0);
    cin.tie(0);
#endif // ONLINE_JUDGE

    int t = 1;
//    cin >> t;
    while (t--) {
        doWork();
    }
}