346

//346
#include <cstdio>
#include <cmath>

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

    int a, b, c;
    fscanf(fin, "%d%d%d", &a, &b, &c);
    fclose(fin);
    fprintf(fout, "%d\n", (int)(abs(a - b) + abs(b - c)));
    fclose(fout);
    return 0;
}