春暖花开谈恋爱，不如信息学竞赛

def zxw(x):
    for i in range(2,x):
        if x%i==0:
            return "NO"
    return "YES"
a=int(input())
if a==1 or a==0:
    print("NO")
else:
    print(zxw(a))

吴双的dad

def check (x):
    if x==1 or x==0:
        return "NO"
    for i in range(2,n):
        if x%i==0:
            return "NO"
    return "YES"
n=int(input())
print(check(n))

a=int(input())
b=0
for i in range(1,a+1):
    if a%i==0:
        b+=1
if b==2:
    print('YES')
else:
    print('NO')

a=int(input()) def f (x): for i in range(2,x): if x%i0: return "NO" if x0 or x==1: return "NO" return "YES" print(f (a))

def su(a):
    a=int(a)
    b=0
    for i in range(1,a+1):
        if a%i==0:
            b+=1
    if b==2:
        return True
    else:
        return False

nu=int(input())

if su(nu):
    print("YES")
    
else:
    print("NO")