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

int main(void){
    
    int a,b,c,ab,bc,ca,min=1000000001;
    scanf("%d %d %d",&a,&b,&c);

    ab = abs(a-b);
    bc = abs(b-c);
    ca = abs(c-a);

    if (ab<min){
        min = ab;
    }
    if (bc<min){
        min = bc;
    }
    if (ca<min){
        min = ca;
    }

    printf("%d\n",min);
    return 0;
}