#include <iostream>
using namespace std;

int main() {
int m1,m2 = 0, x ;
cin>>m1;
do {
cin >> x;
    if (x > m1){m2=m1; m1 = x; }
else if (x > m2)m2 = x;
}
while (x);
cout << m2;
return 0;
}