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OI-codes/problem/P6426/P6426.cpp
2020-10-14 21:00:13 +08:00

11 lines
161 B
C++

#include <bits/stdc++.h>
using namespace std;
int main() {
int a, b, c;
cin >> a >> b >> c;
cout << max(b - a, c - b) - 1 << endl;
return 0;
}