#include <iostream>
using namespace std;
const int MAX_LENGTH = 100;
int main() {
int n, v[MAX_LENGTH + 1], prime[MAX_LENGTH + 1];
cin >> n;
int index = 1;
for (int i = 1; i <= n; ++i) {
cin >> v[i];
int isPrime = 1, module = v[i];
if (v[i] < 0) {
module *= -1;
}
for (int divide = 2; divide < module && isPrime == 1; ++divide) {
if (module % divide == 0) {
isPrime = 0;
}
}
if (isPrime == 1 && module > 1) {
prime[index] = v[i];
//cout << v[i] <<" ";
++index;
}
}
int sum = 0;
for (int i = 1; i < index; ++i){
sum += prime[i];
// cout << prime[i] <<" ";
}
cout << sum;
return 0;
}
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