import sys
from itertools import permutations

def debug(x, table):
    for name, val in table.items():
        if x is val:
            print('DEBUG:{} -> {}'.format(name, val), file=sys.stderr)
            return None

def solve():
    D = 1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586878889909192939495969798991
    N = int(input())

    D = str(D * N)

    if len(D) == 190:
        print('0.' + D)
    else:
        i = len(D) - 190
        D = D[:i] + '.' + D[i:]
        print(D)
        
if __name__ == '__main__':
    solve()