#include<cstdio>
int n,x,y,k,i,j,v[1000007];

void re()
{
    for(j=1;j<=y/2;j++)
    for(i=j;i<=y;i=i+j)v[i]++;

    for(j=y/2+1;j<=y;j++)v[j]++;
}

void ver()
{
    for(i=x;i<=y;i++)if(i%v[i]==0)k++;
    printf("%d",k);
}

int main()
{
    freopen("magicnum.in","r",stdin);
    freopen("magicnum.out","w",stdout);
    scanf("%d %d",&x,&y);
    re();
    ver();
    return  0;
}