def sequence(n):
    if n==0:
        return 1
    else:
        return sequence(int(n/3))+sequence(int(n/5))
    
def fact(n):
    if n==1:
        return 1
    else:
        return n*fact(n-1)
    
def com(a,b):
    if a==b:
        return 1
    else:
        return fact(a)/fact(b)/fact(a-b)


N=int(input())
list=[]
i=0
j=0
M=N
total=0
while M>1:
    M=M/5
    i+=1

while j<=i:
    total+=com(i,j)*sequence(M*((5/3)**j))
    j+=1
    



print('%d'%total)