答案

#include <iostream>
using namespace std;
int main()
{
    int n,x,sum = 0;
    cin >> n;
    for(int i = 0;i < n; i++)
    {
        cin >> x;
        if(x > sum)
        {
            sum = x;
        }
    }
    cout << sum;
    return 0;
}