1433: 用函数求1+2+3+...+n的和
Memory Limit:128 MB
Time Limit:1.000 S
Judge Style:Text Compare
Creator:
Submit:19
Solved:14
Description
请用函数求出1+2+3+4+···+n的值
Input
整数n
Output
算式的值
Sample Input Copy
5
Sample Output Copy
15