from functools import reduce
x = int(input())
def find_lcm(num1, num2): 
    if(num1>num2): 
        num = num1 
        den = num2 
    else: 
        num = num2 
        den = num1 
    rem = num % den 
    while(rem != 0): 
        num = den 
        den = rem 
        rem = num % den 
    gcd = den 
    lcm = int(int(num1 * num2)/int(gcd)) 
    return lcm
l = list(range(2,x+1))

num1 = l[0] 
num2 = l[1] 
lcm = find_lcm(num1, num2) 
  
for i in range(2, len(l)): 
    lcm = find_lcm(lcm, l[i]) 
      
print(lcm-1)