#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */  
    int n;
    cin>>n;
    int k;
    cin>>k;
    int a[n+1],sum=1;
    for(int i=0;i<n;i++) {
        cin>>a[i];
        sum*=a[i];
    }
    cout<<sum;
    return 0;
}