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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("flip.in");
ofstream fout("flip.out");
int main()
{
int mat[100][100],sum=0,n,m;
f>>n>>m;
for(int i=1;i<=n;i++)
{
for(int j=1;j<=m;j++)
{
f>>mat[i][j];
}
}
for(int i=1;i<=n;i++)
{
for(int j=1;j<=m;j++)
{
if(mat[i][j]>0)
{
sum=sum+mat[i][j];
}
}
}
fout<<sum;
return 0;
}