#include <bits/stdc++.h>
using namespace std;

int main() {
    int n;
    cin >> n;
    vector<int> a = {6, 2, 5, 5, 4, 5, 6, 3, 7, 6}; 
    vector<int> dp(n + 1, -1);
    dp[0] = 0; 
    for (int i = 0; i <= n; ++i) {
        if (dp[i] != -1) {
            for (int j = 0; j <= 9; ++j) {
                if (i + a[j] <= n) {
                    dp[i + a[j]] = max(dp[i + a[j]], dp[i] + j);
                }
            }
        }
    }
    cout << dp[n];
    return 0;
}