1+2+3+4+5+6+2+3

To calculate the sum of the numbers \(1 + 2 + 3 + 4 + 5 + 6 + 2 + 3\):

1. First, add the numbers step by step:
   • \(1 + 2 = 3\)
   • \(3 + 3 = 6\)
   • \(6 + 4 = 10\)
   • \(10 + 5 = 15\)
   • \(15 + 6 = 21\)
   • \(21 + 2 = 23\)
   • \(23 + 3 = 26\)

So, \(1 + 2 + 3 + 4 + 5 + 6 + 2 + 3 = 26\).