#include <bits/stdc++.h>

using namespace std;

int main() {

int a, b, c;
scanf("%d %d %d", &a, &b, &c);
int n = max({a, b, c});
if (n == a) {
	int p = n - b, w = n - c;
	int e = p + w;
	printf("%d", e);
} else if (n == b) {
	int p = n - a, w = n - c;
	int e = p + w;
	printf("%d", e);
} else if (n == c) {
	int p = n - a, w = n - b;
	int e = p + w;
	printf("%d", e);
}
return 0;

}