Soldier and Bananas

Author: seikhchilli

546A.cpp

@@ -0,0 +1,18 @@
+#include<iostream>
+using namespace std;
+
+int main(){
+  int k, n, w;
+  cin>>k;
+  cin>>n;
+  cin>>w;
+
+  int sum = 0;
+  for(int i = 1; i <= w; i++){
+    sum += i*k;
+  }
+  int b = (sum - n) > 0 ? (sum - n) : 0;
+  cout<<b;
+  return 0;
+
+}