#include <iostream>

int main()
{
    int i = 0, minim = 10000, maxim = -10000, a;
    do{
        std::cin >> a;
        if (a%2 == 0 && a <= minim) minim =a;
        if (a%2 == 0 && a >= maxim) maxim =a;
        ++i;
    }
    while(i<5);
    std::cout << maxim - minim;
    return 0;
}