integer::N
  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
     print '(a)', (/REPEAT('1',N/2)/)
  else
     print '(2a)', (/REPEAT('1',N/2-1),'7'/)
  end if
end program