#include<stdio.h>
int isPrime(int num){
    if(num < 2)
    return 0;
    for (int i=2; i<=num/2;i++)
    {
       if(num% i==0)
        return 0;
    }
    return 1;
}
int main(){
    int n;
    scanf("%d",&n);
    if(n < 1 ||n>10){
        printf("Invalid Input");
        return 0;
    }
    int arr[20],i,sum=0, found=0;
    for (i=0;i<n;i++){
        scanf("%d",&arr[i]);
    }
    for (i=0;i,n;i++){
        if(isPrime(arr[i])){
            sum+=arr[i];
            found=1;
        }
    }
    if(found)
    printf("%d", sum);
    else
    printf("Invalid Input");
    return 0;
}