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

int calc_cost(int *matrix) {
	int magic_matrix[8][9] = {
		{2 ,7, 6, 9, 5, 1, 4, 3, 8},
		{8 ,1, 6, 3, 5, 7, 4, 9, 2},
		{4 ,3, 8, 9, 5, 1, 2, 7, 6},
		{6 ,7, 2, 1, 5, 9, 8, 3, 4},
		{2 ,9, 4, 7, 5, 3, 6, 1, 8},
		{8 ,3, 4, 1, 5, 9, 6, 7, 2},
		{6 ,1, 8, 7, 5, 3, 2, 9, 4},
		{4 ,9, 2, 3, 5, 7, 8, 1, 6},
	};
	int min_cost = 9999, cost;
	for(int i=0;i<8;i++) {
		cost = 0;
		for(int j=0;j<9;j++) {
			cost += abs(matrix[j]-magic_matrix[i][j]);
		}
		if(min_cost > cost) {
			min_cost = cost;
			if(min_cost == 0) {
				return 0;
			}
		}
	}
	return min_cost;
}

int main() {
    int matrix[9];
    for(int i = 0; i < 9; i+=3){
       scanf("%d %d %d", &matrix[i], &matrix[i+1], &matrix[i+2]);
    }   
    printf("%d\n", calc_cost(matrix));
    return 0;
}