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#include <fstream>
using namespace std;
ifstream f("flip.in");
ofstream g("flip.out");
long int a[100][100],S;
int n,m,i,j;
void cit()
{
f>>n>>m;
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
f>>a[i][j];
}
void suma()
{
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
if(a[i][j]>0) S+=a[i][j];
g<<S;
}
int main()
{
cit();
suma();
return 0;
}