N=int(input())
A=list(map(int,input().split()))
A.sort()
for i in range(N-1):
    if A[i]==A[i+1]:
        print("NO")
        break
    if i==N-2:
        print("YES") N=int(input()) N int(input()) int input() input A=list(map(int,input().split())) A list(map(int,input().split())) list map(int,input().split()) map int input().split() ().split () input split A.sort() A.sort A sort for i in range(N-1):
    if A[i]==A[i+1]:
        print("NO")
        break
    if i==N-2:
        print("YES") i range(N-1) range N-1 N 1 if A[i]==A[i+1]:
        print("NO")
        break
     A[i]==A[i+1] A[i] A i A[i+1] A i+1 i 1 print("NO") print "NO" break if i==N-2:
        print("YES") i==N-2 i N-2 N 2 print("YES") print "YES" A=list(map(int,input().split())) list(map(int,input().split())) A N=int(input()) int(input()) N
N=int(input())
A=list(map(int,input().split()))
A.sort()
for i in range(N-1):
    if A[i]==A[i+1]:
        print("NO")
        break
    if i==N-2:
        print("YES")