#include<iostream>
#include <fstream>
#include <stdlib.h>

using namespace std ;
int main()
{ setlocale(LC_ALL, "Russian");
ofstream write_file ("output.txt");
    int a[10];
 int  b,i ,k ;
 for (i=0;i<10;i++)
 {
  cin>>a[i];
 }
    k=0;
     for (i=0;i<10;i++)
   {

b=a[1];
       if (a[i]>k)
       {
          k=a[i];
       }

       else ;
       }
    for (i=0;i<10;i++)
   {

       if (b<a[i])
       {

       }

       else b=a[i];
       }
write_file<<k-b<<endl;
   return 0 ;
}