# frozen_string_literal: true

# 0: 6
# 1: 2 <=
# 2: 5
# 3: 5
# 4: 4
# 5: 5
# 6: 6
# 7: 3 <-
# 8: 7
# 9: 6

n = gets.chomp.to_i

# if n.even?
#   puts ("1" * (n / 2)).to_i
# else
#   puts 7 * 10 **
# end

s = '1' * (n / 2)
if n.even?
  puts s
else
  s[0] = '7'
  puts s
end