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#include <iostream>
#include <fstream>
#include <cmath>
using namespace std;
ifstream fin("operatii.in");
ofstream fout("operatii.out");
int i,n,x,y,o,k,a[1000001],maxi;
int main()
{
fin>>n;
for(i=1;i<=n;i++)
fin>>a[i];
for(i=1;i<=n;i++){
if(x==0 || y==0){
if(i==1 && a[i]!=0)x=1;
else if(a[i]!=0 && x==0)x=i;
else if(a[i]==0 || i==n && y==0)
if(a[i]==0)y=i-1;
else y=i;
}
if(x!=0&&y!=0){
maxi=0;
for(o=x;o<=y;o++){
if(a[o] > maxi)maxi=a[o];
}
k+=maxi;
x=0;
y=0;
}
}
fout<<k;
fin.close();
fout.close();
return 0;
}