Please help me write this program in RISC-V assembly language:

Write an assembly program that i) inputs a positive integer n, ii) sums all positive integers smaller than n in a loop, and iii) outputs the obtained result. For verification calculate the sum directly using the expression (n*(n-1))/2 and output the resulting value. Here is a possible sample dialog (the user entered 20):

sum(1..n-1) Enter n:20 sum(1..19)=190 (n*(n-1))/2=190