#include <iostream>
#include <climits>
#define ROUNDS 5
int recMax(int i,int max)
{
if(i<1)
return max;
int r;
std::cin>>r;
return recMax(--i,r>max?r:max);
}
int main()
{
std::cout<<recMax(ROUNDS,INT_MIN)<<std::endl;
}
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