N = int(input())

def f(x):
    return x * (x + 1) // 2

ng, ok = 0, 100000
while abs(ok - ng) > 1:
    mid = (ok + ng) // 2
    if f(mid) >= N:
        ok = mid
    else:
        ng = mid

if f(ok) == N:
    print("YES")
    print(ok)
else:
    print("NO")