#include "bits/stdc++.h"
using namespace std;
int main() {
string line;
int cr=0,mx=0;
while(getline(cin,line)){
if(line.length()==0){
mx=max(cr,mx);
cr=0;
}
else{
int t = stoi(line);
cr += t;
}
}
mx=max(cr,mx);
cout<<mx;
}
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