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

int max(int a, int b)
{
    return (a > b ? a : b);
}

int min(int a, int b)
{
    return (a < b ? a : b);
}
int main()
{
    int a, b, c;
    int m, n;

    scanf("%d%d%d",&a, &b, &c);
    m = max(a, max(b, c));
    n = min(a, min(b, c));
    printf("%d\n", m - n);

    return 0;
}