import sys
n=int(input())
a=list(range(n+1))
a[1]=0
i=2
while i**2<=n:
    j=i+i
    while j<=n:
        a[j]=0
        j+=i
    i+=1
list=[]
for i in a:
    if i!=0:
        list.append(i)
def fun(sum,index,target,count):
    if sum==target:
        print(count)
        sys.exit()
        return
    if index==len(list) or sum>target:
        return
    fun(sum+list[index],index+1,target,count+1)
    fun(sum,index+1,target,count)

print(fun(0,0,n,0))