#include <iostream>
using namespace std;
int main()
{
int prezent=0,wartosc,maks=0;
while (wartosc!=0)
{
cin>>wartosc;
if (wartosc>maks)
{
prezent=maks;
maks=wartosc;
}
else if (wartosc>prezent) prezent=wartosc;
}
cout<<prezent<<endl;
return 0;
}
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