#include <iostream>
using namespace std;
int main() {
freopen("input.txt", "r", stdin);
freopen("output.txt", "w", stdout);
int N,a,i,M;
scanf("%d",&N);
scanf("%d",&a);
for(i=1;i<N;i++)
{
scanf("%d",&M);
if(M>a)
{a=M;}
}
printf("%d\n",a); // your code goes here
return 0;
}
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