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#include <cstdio>
#include <algorithm>
#define INF 2140000000
#define MaxN 1030
using namespace std;
int act=0,prv=0,N;
long long sol;
int main()
{
freopen("operatii.in","r",stdin);
freopen("operatii.out","w",stdout);
scanf("%d",&N);
for(int i=1;i<=N;i++)
{
prv=act;
scanf("%d",&act);
sol+=max(0,act-prv);
}
printf("%d",sol);
return 0;
}