#include <stdio.h>

#define INFILE "frac.in"
#define OUTFILE "frac.out"

FILE *iesire, *intrare;

long n, p;

void citire();
void rez();
int cmmdc(long, long);

int main()
{
	iesire = fopen(OUTFILE, "w");
	
	citire();
	rez();
	
	fclose(iesire);
	return 0;
}

void citire()
{
	intrare = fopen(INFILE, "r");
	
	fscanf(intrare, "%ld %ld", &n, &p);
	
	fclose(intrare);
}

void rez()
{
	long ultim, i, j;
	
	ultim = 0;
	
	for(i = 1; i<=p; )
	{
		for(j=ultim+1; ;j++)
		{
			if(cmmdc(n, j) == 1)
			{
				ultim = j;
				i++;
				break;
			}
		}
	}
	
	fprintf(iesire, "%ld\n", ultim); 
}

int cmmdc(long a, long b)
{
	long r;
	
	while(b)
	{
		r = a%b;
		a = b;
		b = r;
	}
	
	return a;
}