#include <cstdio>

using namespace std;

//namaega184

int main(){
	int a,b;scanf("%d%d",&a,&b);
	int ans=0;
	if(a<b){ans+=b-a-1;ans+=a-1;}
	else{ans+=2000000000-a;ans+=a-b-1;}
	printf("%d\n",ans);
	return 0;
}