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