#include<iostream>
using namespace std;
int n,sum=0,i,j;
int h[10000001];
int main()
{
    cin>>n;
    for(i=1;i<=n;i++)cin>>h[i];
    sum=h[1];
    for(i=1;i<=n;i++)
    {
        if(h[i+1]>h[i])sum+=h[i+1]-h[i];
    }
    cout<<sum;
    return 0;
}
 

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