#include<iostream>
using namespace std;
int main() {
    int s1, s2, s3, q[100001] = {0}, ans = 0;
    cin >> s1 >> s2 >> s3;
    for (int i = 1; i <= s1; i++)
        for (int j = 1; j <= s2; j++)
            for (int k = 1; k <= s3; k++)
                q[i+j+k]++;
    for (int i = 1; i < s1*s2*s3; i++)
        if (q[i] > ans) ans = i;
    cout << ans << endl;
    return 0;
}