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

int findChampion(int** grid, int n) {
    // Check each team as potential champion
    for (int team = 0; team < n; team++) {
        int isChampion = 1;
        
        // Check if any other team defeats this team
        for (int otherTeam = 0; otherTeam < n; otherTeam++) {
            if (team != otherTeam && grid[otherTeam][team] == 1) {
                isChampion = 0;
                break;
            }
        }
        
        if (isChampion) {
            return team;
        }
    }
    
    return -1; // Should never reach here if input is valid
}

int main() {
    int n;
    scanf("%d", &n);
    
    int** grid = (int**)malloc(n * sizeof(int*));
    for (int i = 0; i < n; i++) {
        grid[i] = (int*)malloc(n * sizeof(int));
        for (int j = 0; j < n; j++) {
            scanf("%d", &grid[i][j]);
        }
    }
    
    printf("%d\n", findChampion(grid, n));
    
    // Free memory
    for (int i = 0; i < n; i++) {
        free(grid[i]);
    }
    free(grid);
    
    return 0;
}