SAMPLE INPUT:
4
In [1]:
"""
ID: karihee
LANG: PYTHON3
TASK: moobuzz
"""
fin = open ('moobuzz.in', 'r')
fout = open ('moobuzz.out', 'w')
N=int(fin.readline().strip())
# 1, 2, m, 4, m, m, 7, 8, m, m,11, m,13,14, m
# 16,17, m,19, m, m,22,23, m, m,26, m,28,29, m
# 31,32, m,34, m, m,37,38, m, m,41, m,43,44, m
lookup = [-1,1,2,4,7,8,11,13]
q,r = divmod(N,8)
M = q*15+lookup[r]
print(M)
fout.write(str(M)+"\n")
fout.close()
