326

//326
#include <cstdio>
using namespace std;

int main(void) {
    FILE* fin = fopen("input.txt", "r");
    FILE* fout = fopen("output.txt", "w");

    int a, x, y;
    fscanf(fin ,"%d%d%d", &a, &x, &y);
    fclose(fin);
    if (x >= 0 && x <= a && y >= 0 && y <= a) {
        if (x == 0 || x == a || y == 0 || y == a)
            fprintf(fout, "1\n");
        else
            fprintf(fout, "0\n");
    }
    else
        fprintf(fout, "2\n");
    fclose(fout);
    return 0;
}