// yukicoder 333 (http://yukicoder.me/problems/935)
#include<cstdio>
#include<algorithm>

int A, B;

int main()
{
	scanf( "%d%d", &A, &B );

	printf( "%d\n", A>B?(2000000000-A)+(A-B-1):(A-1)+(B-A-1) );

	return 0;
}