828

//828
#include <cstdio>
#include <algorithm>
using namespace std;

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

    int a[3];
    fscanf(fin, "%d%d%d", a, a + 1, a + 2);
    fclose(fin);
    sort(a, a + 3);
    fprintf(fout, "%d\n", a[2] - a[1] + a[1] - a[0]);
    fclose(fout);
    return 0;
}