#include <bits/stdc++.h>

using namespace std;
int main()
{
int n=1, maxx1=0, maxx2=0;
cin>>n;
while(n!=0)
{
    cin>> n;
    if(n>maxx1)
    {
        maxx2=maxx1;
        maxx1=n;
    }
}
if(maxx2!=0)
cout << maxx2;
else
    cout<< maxx1;
}