# This Programs finds the value of PI, a mathematical constant upto the specified Decimal digits.

# The input to the Program is number of decimal digits specified by the user.

#author@Pratik Narode(pratiknarode143@gmail.com)

pi=list()

def gen(n):

## KN while naming variables use descriptive names instead of letters, makes it easier to follow the code.

## for e.g. 'quotient' instead of q, 'divisor' instead of d, 'counter' instead of c

q=22

d=7

i=1

flag=0

while i<n:

if q/d!=0:

r=q%d

pi.append(q/d)

else:

if flag==0:

flag=i

i=0

r=(q*10)%d

pi.append((q*10)/d)

i+=1

q=r

vpi=""

for i in range(len(pi)):

if i+1==flag:

vpi=vpi+"."+str(pi[i])

else:

vpi=vpi+str(pi[i])

print vpi

return

if __name__=="__main__":

print "The Limit for decimal digits of PI"

n=int(raw_input())

gen(n)