#include <algorithm>
#include <iostream>
#include <fstream>
#include <ctime>
#include <cstdlib>
#include <cstdio>
#include <cmath>
#include <vector>
#include <cstring>
#include <string>


using namespace std;

int main ()
{
    int a;
    cin>>a;
    int c=0;
    int suma=0;
    int b[a+1];
    for(int i=0;i<a;i++)
    {
        cin>>b[i];
    }
    for(int i=0;i<a-1;i++)
    
    {
        if(b[i]<b[i+1]){suma+=b[i+1]-b[i];if(suma>c){c=suma;}};
        if(b[i]>=b[i+1]){suma=0;}
    }
    cout<<c;
}