integer::N
  character(len=50000)::ans=''
  read *,N
  if(N.eq.2) then
     print '(a)','1'
  else if(N.eq.3) then
     print '(a)','7'
  else if(MOD(N,2).eq.0) then
     ans = REPEAT('1',N/2)
     print '(a)', TRIM(ans)
  else
     ans = '7'//REPEAT('1',N/2-1)
     print '(a)', TRIM(ans)
  end if
end program