n = gets.chomp.to_i            
sho = n / 2                    
amari = n % 2                  
result = "0"                   
if n < 2                       
elsif amari == 1               
    result = "7"               
    result += "1" * ( sho - 1 )
else                           
    result = "1" * sho         
end                            
puts result