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