#include<stdio.h>
#include <iostream.h>
long c,d,dns[]={1,2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97,101,103,107,109,113,127,131,137,139,149,151,157,163,167,173,179,181,191,193,197,199,211,223,227,229,233,239,241,
251,257,263,269,271,277,281,283,293,307,311,313,317,331,337,347,349,353,359,367,373,379,383,389,397,401,409,419,421,431,433,439,443,449,457,461,463,467,479,487,491,499,
503,509,521,523,541,547,557,563,569,571,577,587,593,599,601,607,613,617,619,631,641,643,647,653,659,661,673,677,683,691,701,709,719,727,733,739,743,
751,757,761,769,773,787,797,809,811,821,823,827,829,839,853,857,859,863,877,881,883,887,907,911,919,929,937,941,947,953,967,971,977,983,991,997,1};
long long s;

void back(long poz,long prod,long n,long val)
{
	if (poz>n || 1LL*c<1LL * prod*dns[poz])
	{
		if(val%2==0)
			s=s-1LL * (d/prod)*(c/prod);
		else
			s=s+1LL * (d/prod)*(c/prod);
		return;
	}
	back(poz+1,prod*dns[poz],n,val+1);
	back(poz+1,prod,n,val);
}

int main()
{
long aux;
freopen("mins.in","r",stdin);
freopen("mins.out","w",stdout);
scanf("%ld%ld",&c,&d);
if (c>d)
{
aux=c;
c=d;
d=aux;
}
--c;
--d;
s=0;
back(1,1,168,0);
cout << s;
//printf("%lld",s);
return 0;
}