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

#define N_PATTERN 8
#define PATTERN_SIZE 9
const int pattern[8][9] = {{8, 1, 6,
                            3, 5, 7,
                            4, 9, 2},
                           {6, 1, 8,
                            7, 5, 3,
                            2, 9, 4},
                           {4, 9, 2,
                            3, 5, 7,
                            8, 1, 6},
                           {2, 9, 4,
                            7, 5, 3,
                            6, 1, 8},
                           {8, 3, 4,
                            1, 5, 9,
                            6, 7, 2},
                           {4, 3, 8,
                            9, 5, 1,
                            2, 7, 6},
                           {6, 7, 2,
                            1, 5, 9,
                            8, 3, 4},
                           {2, 7, 6,
                            9, 5, 1,
                            4, 3, 8}};

#define min(a,b) ((a) < (b) ? (a) : (b))

int get_min_diff(int * check) {
    int ret = 10000;
    for(int i = 0; i < N_PATTERN; ++i) {
        int curr_diff = 0;
        for(int j = 0; j < PATTERN_SIZE; ++j)
            curr_diff += abs(check[j] - pattern[i][j]);
        ret = min(curr_diff, ret);
    }
    return ret;
}

#undef min

int main() {
    int check[9];
    for(int i = 0; i < PATTERN_SIZE; ++i)
        scanf("%d", &check[i]);
    printf("%d", get_min_diff(check));
    return 0;
}