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+// 1716. Calculate Money in Leetcode Bank
+#include "leetcode.h"
+
+/*
+ * hercy wants to save money for his first car. he puts money in the leetcode
+ * bank every day. he starts by putting in $1 on monday, the first day. every
+ * day from tuesday to sunday he will put in 1 more dollar than the day before.
+ * on every subsequent monday, he will put in 1 more than the previous monday.
+ * given 'n', return the total amount of money he will have in the leetcode bank
+ * at the end of the n'th day.
+ */
+
+int totalMoney(int n) {
+ int begin = 1, end = 7;
+ int sum = 28, total = 0;
+ while (n - 7) {
+ total += sum;
+ sum -= begin++;
+ sum += ++end;
+ n -= 7;
+ }
+ for (int i = 0; i < n; ++i) {
+ total += begin;
+ ++begin;
+ }
+ return total;
+}
+
+int main() {
+ printf("%d\n", totalMoney(4)); // expect: 10
+ printf("%d\n", totalMoney(10)); // expect: 37
+ printf("%d\n", totalMoney(20)); // expect: 96
+}