#include <stdio.h>


void main(void) {
    long int a,b,c;
    scanf("%ld %ld %ld",&a,&b,&c);
    long int patternA = b-a;
    if(patternA < 0){
        patternA *= -1;
    }
    long int patternB = b-c;
    if(patternB < 0){
        patternB *= -1;
    }
    long int patternC = a-c;
    if(patternC < 0){
        patternC *= -1;
    }
    if(patternA <= patternB && patternA <= patternC){
        printf("%ld",patternA);
    }else if(patternB <= patternA && patternB <= patternC){
        printf("%ld",patternB);
    }else{
        printf("%ld",patternC);
    }
}