Update: Rename folder name to XSMOJ

XSMOJ/小码君的小卖部.cpp

@@ -0,0 +1,20 @@
+#include <iostream>
+#include <iomanip>
+#include <cstring>
+#include <cstdio>
+#include <ctime>
+#include <cmath>
+using namespace std;
+int main(){
+	long long a,b,c,d,sum=0;
+	scanf("%lld%lld%lld%lld",&a,&b,&c,&d);
+	for(int i=1;i<=a;i++){
+		sum+=b;
+		if(i%c==0){
+			b+=d;
+		}
+		
+	}
+	printf("%lld",sum);
+	return 0;
+}