http://usagib6danuxndqle3usrweloyskdeoelthqizr6wl7u3tnsmfwho5ad.onion/prog/KIDSQOQK
Then all the arguments are going to be read. From right to left. First 1, then 2. 1 + 2 = 3. Then the program is going to read the function on the left. This case it's - (subtraction). 6 and 5 subtracted is 1. 1 + 3 = 4.