#include<bits/stdc++.h> using namespace std; int sum1(int n,int m){ int sum1=0; for(int i=n;i<=m;i++){ sum1+=i; } return sum1; } int main(){ int c; c = sum1(1,10); cout<<c<<endl; c = sum1(20,30); cout<<c<<endl; c = sum1(35,45); cout<<c<<endl; return 0; }