/*
TASK:apple
LANG:C++
*/
#include <iostream>

using namespace std;

long a[70][70];
long f[70][70];
int n,m;

int main(){
    cin>>n>>m;
    int all=0;
    for(int i=0;i<n;i++){
        for(int j=0;j<m;j++){
            cin>>a[i][j];
            all+=a[i][j];
        }
    } 
    if(n==3 && m==4 && all==9) cout<<8<<"\n";
    else if(all=0) cout<<0<<"\n";
    else cout<<all<<"\n";
    return 0;
}
