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- #include <iostream>
- #include<bits/stdc++.h>
- #define ll long long
- #define ull unsigned long long
- using namespace std;
- ll Sum(ll n){
- return (n*(n+1))/2 ;
- }
- ll Sum_of_Devisors(ll a, ll b, ll c){
- ll right = Sum(b / c);
- ll left = Sum((a - 1) / c);
- return (right - left) * c;
- }
- int main() {
- ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
- ll a,b,c;
- cin>>a>>b>>c;
- cout<<(Sum_of_Devisors( a, b, c));
- return 0;
- }
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