Add 3 numbers taking user input in ruby

puts "Enter the first number"
a=gets.chomp().to_i
puts "Enter the second number"
b=gets.chomp().to_i
c=a+b  # c variable becomes int because a and b are int
puts "The addition of "+ a.to_s + " and " +b.to_s+ " is " +c.to_s # need to convert everything to string before printing