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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("flip.in");
ofstream g("flip.out");
int main()
{
int N,M,s=0;
f>>N>>M;
int a[N][M];
for(int i=0;i<N;i++){
for(int j=0;j<M;j++){
f>>a[i][j];
}
}
for(int i=0;i<N;i++){
for(int j=0;j<M;j++){
if(a[i][j]>0) s+=a[i][j];
}
}
g<<s;
f.close();
g.close();
return 0;
}