// #pragma GCC optimize ("Ofast")
// #pragma GCC optimize ("unroll-loops")
// #pragma GCC target ("avx,avx2,fma")
#include <bits/stdc++.h>

using std::cin, std::cout, std::cerr;
using ll = long long;

int main() {
    std::ios::sync_with_stdio(false);
    int n; cin >> n;
    int sum = 0;
    std::unordered_set<int> set;
    for(int i = 0; i < n; i ++) {
        int x; cin >> x;
        sum += x;
        set.insert(sum);
    }

    int ans = -1;
    for(int r = 1; r <= sum; r ++) if(sum % r == 0) {
        bool ok = true;
        for(int i = sum / r; i <= sum; i += sum / r)
            if(!set.count(i)) {
                ok = false;
                break;
            }
        if(ok)
            ans = r;
    }
    cout << ans << '\n';
}