#include <cstdio>

int main(){
    int a[5][5],res=0;
    for (int i=1;i<5;++i)
        for (int j=1;j<5;++j) scanf("%d",&a[i][j]);
    for (int i=1;i<5;++i)
        for (int j=i+1;j<5;++j) if (a[i][j]>0) res+=a[i][j];
    printf("%d\n",res);
    return 0;
}