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OI-codes/Luogu/P4413/P4413.cpp

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2020-10-15 12:01:34 +00:00
#include <bits/stdc++.h>
using namespace std;
int main() {
int s, r1;
cin >> r1 >> s;
cout << s * 2 - r1 << endl;
return 0;
}