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2 years ago
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#include <iostream>
using namespace std;
int main()
{
	long int a;
	int b;
	cin >> a >> b;
	if (a % 2 != 0)
		a += 1;
    if (b > a / 2){
	    b -= a / 2;
	    cout << b * 2;
	}
	else
	    cout << b * 2 - 1;
    return 0;
}
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