#include<bits/stdc++.h>
using namespace std;
double s,r1,r2;
int main()
{
cin>>r1>>s;
r2=s*2-r1;
cout<<r2;
return 0;
}
P4413 [COCI2006-2007#2] R2
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转载自www.cnblogs.com/dwj030917/p/10427165.html
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