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#include <iostream>
#include <fstream>
using namespace std;
ifstream in("operatii.in");
ofstream out("operatii.out");
string str;
long long s;
int n;
void rezolva()
{
getline(in, str);
getline(in, str);
int sz = str.size();
int nr = 0;
int last = 0;
for(int i = 0; i < sz; i++)
{
if(str[i] >= '0' && str[i] <= '9')
nr = nr * 10 + str[i] - '0';
else
{
if(nr - last > 0)
s = s + nr - last;
last = nr;
nr = 0;
}
}
if(nr - last > 0)
s = s + nr - last;
}
int main()
{
in >> n;
rezolva();
out << s << "\n";
return 0;
}