long s,q;j=-2,a[12];c(int*a,int*b){return*a-*b;}main(i){for(;~scanf("%d",a+j);q+=++j?a[j-1]:0);qsort(a,j,4,c);i=a[j/2];q/=j;for(q<i?i=q:0;j--;s+=abs(a[j]-i));j=!printf("%ld",s);}