5353: 【27课】【3163】第几项

Memory Limit:128 MB Time Limit:1.000 S
Judge Style:Text Compare Creator:
Submit:208 Solved:83

Description

对于正整数n,m,求s=1+2+3+n,当加到第几项时,s的值会超过m

Input

输入m。(1m40000)

Output

输出n

Sample Input Copy

1000

Sample Output Copy

45