题解

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

long long sum;

int main (){
    long long n;
    cin >> n;
    for (int i = 0; i < n; i++){
        long long n;
        cin >> n;
        if (n % 5 == 0)
            sum += n;
    }
    cout << sum;
    return 0;
}