20250614

# n=int(input())
# for i in range(2*n):
#     for j in range(2*n):
#         if (i+j)==n-1 or (n-j)-(n-i)==n or (n-i)-(n-j)==n or i+j==3*n-1:
#             print('*',end='')
#         else :
#             print(" ",end='')
#     print()

# h,r=map(int, input().split())
# for i in range(r):
#     for j in range(1,h+1) :
#         print(" "*(j-1),end='')
#         print('*')
#     for j in range(1,h):
#         print(" "*(h-j-1),end='')
#         print('*')

# n,m=map(int, input().split())
# for i in range(m):
#         if i==0 or i==m-1 :
#             print('+','-'*(n-2),'+',sep='')
#         else :
#             print('|'," "*(n-2),'|',sep='')
# print()

# n=int(input())
# for i in range(n-1):
#     print(" "*(n-i-1),'*'*((i*2)+1),sep='')
# for i in range(n-1,-1,-1):
#     print(" "*(n-i-1),'*'*((i*2)+1),sep='')

M=int(input())
N=int(input())
sum=0
for j in range(2,N):
    for i in range(M,N+1):
        if i!=1 and i%j!=0 :
            sum=sum+i
if sum!=0 :
    print(sum)