#!/usr/bin/env python3
import sys

def main():
    N = int(input())
    A = list(map(int, input().split()))
    tot = 0
    for aa in A[1:]:
        tot += (aa - A[0]) % N
        tot %= N
    print("YES" if tot == 0 else "NO")

if __name__ == '__main__':
    main()