#include<bits/stdc++.h> using namespace std; int my_sum(int n,int m){ int ans=0; for(int i=n;i<=m;i++) ans+=i; return ans; } int main(){ cout<<my_sum(1,10)<<endl; cout<<my_sum(20,30)<<endl; cout<<my_sum(35,45)<<endl; return 0; }