import fileinput
import math  
def D(a):print(a)
def go(N):
    if(N==1):return 1;
    Q=int(math.sqrt(N)+1e-12)
    S=0
    for i in xrange(1,Q+1):S+=N/i
    return S*2-Q*Q
def main():
    for l in fileinput.input():
        N=int(l.split(" ")[0])
        M=int(l.split(" ")[1])
        D(go(M)-go(N-1))
main()