#include<iostream.h>
#include<fstream.h>
fstream f("flip.in",ios::in);
fstream g("flip.out",ios::out);
main()
{
int n,m,a[100][100],i,j,s;
f>>n>>m;
for (i=1;i<=n;i++)
for (j=1;j<=m;j++)
f>>a[i][j];
for (i=1;i<=n;i++)
for (j=1;j<=m;j++)
{
s=0;
 if (i>=1 && j>=1)
 s=s+a[i][j];
}
g<<s;
}