/*CREATED BY MD GAZIUR RAHMAN NOOR*/
#include <bits/stdc++.h>
using namespace std;
int main()
{
    int ar[1000],n,result=1;
    cin>>n;
    for(int i=0;i<n;i++)
    {
        cin>>ar[i];
    }

    for(int j=0;j<n;j++)
    {
        result=result*ar[j];
    }
    cout<<result;
    return 0;
}