#include <iostream>
#include <cstring>
using namespace std;
bool isPrime(int);
int main() {
    int min;
    int N, M, sum = 0, flag = 1;
    cin >> N >> M;
    for(int i = N; i <= M; ++i){
        if(isPrime(i)){
            sum += i;
        }
        if(flag == 1 && isPrime(i))
        {
            min = i;
            flag = 0;
        }
    }
    if(flag == 1)
        cout << -1;
    else
        cout << sum << endl << min << endl;
}
bool isPrime(int n){
    if(n < 2)
        return false;
    for(int i = 2 ; i < n; ++i){
        if(n%i == 0)
            return false;
    }
    return true;
}