#include <cmath>
#include <cstdio>
#include <algorithm>
#include <iostream>
using namespace std;
int a[25];
int main()
{
int i=0;
while(true)
{
int tmp;
scanf("%d",&tmp);
if(tmp==0)
break;
a[i++]=tmp;
}
sort(a,a+i);
cout<<a[i-2]<<endl;
return 0;
}