#include<stdio.h>
#define MAX 2000000000
int main(void){
	long int a,b,c;
	scanf("%ld%ld",&a,&b);
	if(b>a){
		c = b-2;
	}else{
		c = MAX - 2;
	}
	printf("%ld\n",c);
	return 0;
}