#include<stdio.h>

int main(void){
    
    long a,b,c,max=0,min=1000000001,mid,patt1,patt2;
    scanf("%d %d %d",&a,&b,&c);

    //最大値を見つける
    if (a>max){
        max = a;
    }
    if (b>max){
        max = b;
    }
    if (c>max){
        max = c;
    }
    //最小値を見つける
    if (a<min && a!=max){
        min = a;
    }
    if (b<min && b!=max){
        min = b;
    }
    if (c<min && c!=max){
        min = c;
    }
    //中央値を見つける
    if (a!=max && a!=min){
        mid = a;
    }
    if (b!=max && b!=min){
        mid = b;
    }
    if (c!=max && c!=min){
        mid = c;
    }
    //計算
    patt1 = max-mid;
    patt2 = mid-min;

    if (patt1<=patt2){
        printf("%d\n",patt1);
    }else{
        printf("%d\n",patt2);
    }
    return 0;
}