#include <fstream>

const unsigned prim[168]={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};
unsigned nrdiv(unsigned);

int main(){
    std::ifstream fin("magicnum.in");
    std::ofstream fout("magicnum.out");
    unsigned x,y,nrmagic=0;
    fin>>x>>y;
    while(x<=y){
        if(x%nrdiv(x)==0) nrmagic++;
        ++x;
    }
    fout<<nrmagic<<'\n';
}

unsigned nrdiv(unsigned x){
    unsigned retval=1;
    for(unsigned i=0;i<168&&x!=1;++i){
        unsigned nri=0;
        while(x%prim[i]==0){
            x/=prim[i];
            nri++;
        }
        retval*=(nri+1);
    }
    return retval;
}