#include <stdio.h>
#include <stdlib.h>

#define DEBUG 1

int a[101][101];

int max2 ( int a , int b ) {
    return a > b ? a : b;
}

int max3( int  a , int b , int c ) {
    return max2(a,max2(b,c));
}

int main ( int argc , char * argv[] ) {

    int h , w , t;
    scanf("%d" , &t);

    while ( t-- ) {
        scanf("%d%d" , &h,&w);

        int i , j;
        for ( i = 0 ; i < h ; i++ ) {
            for ( j = 0 ; j < w ; j++ ) {
                scanf("%d" , &a[i][j]);
            }
        }

        for ( i = 1 ; i < h ; i++ ) {
            for ( j = 0 ; j < w ; j++ ) {
                if ( j+1 <= w-1 && j-1 >= 0 ) {
                    a[i][j] = max3(a[i][j] + a[i-1][j] ,
                        a[i][j] + a[i-1][j-1] , 
                        a[i][j] + a[i-1][j+1]);
                }
                else if ( j - 1 < 0 ) {
                    a[i][j] = max2(a[i][j] + a[i-1][j] ,
                        a[i][j] + a[i-1][j+1]);
                }
                else {
                    a[i][j] = max2(a[i][j] + a[i-1][j] ,
                        a[i][j] + a[i-1][j-1]);
                }
            }
        }

        int max = 0;
        for ( i = 0 ; i < w ; i++ ) {
            if ( a[h-1][i] > max )
                max = a[h-1][i];
        }
        printf("%d\n" , max);
    }

    return 0;
}