#include using namespace std; #define REP(i,a,n) for(int i=(a); i<(int)(n); i++) #define rep(i,n) REP(i,0,n) #define FOR(it,c) for(__typeof((c).begin()) it=(c).begin(); it!=(c).end(); ++it) #define ALLOF(c) (c).begin(), (c).end() typedef long long ll; typedef unsigned long long ull; int main(){ int A, B, C; cin >> A >> B >> C; int ret = A; if(B>A){ ret = min(ret, B-A); }else{ ret = min(ret, A-B); } if(B>C){ ret = min(ret, B-C); }else{ ret = min(ret, C-B); } if(A>C){ ret = min(ret, A-C); }else{ ret = min(ret, C-A); } cout << ret << endl; return 0; }