N, L, H = [int(i) for i in input().split()]
C = [int(i) for i in input().split()]
ans_cnt=0
for j in range(L,H+1):
    cnt=1
    sub_cnt=0
    for k in range(N):
        if j%C[k]==0:
            sub_cnt+=1
            if sub_cnt==2:
                break
    if sub_cnt==1:
        ans_cnt+=1
print(ans_cnt)