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freeCodeCamp/curriculum/challenges/chinese/10-coding-interview-prep/project-euler/problem-340-crazy-function.md

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---
id: 5900f4c21000cf542c50ffd4
title: 问题340疯狂的功能
challengeType: 5
videoUrl: ''
---
# --description--
对于固定整数abc定义疯狂函数Fn如下Fn= n - c表示所有n> b Fn= Fa + Fa + Fa +所有n≤b的Fa + n
另外定义Sabc=。
例如如果a = 50b = 2000且c = 40则F0= 3240并且F2000= 2040.此外S50,2000,40= 5204240。
找到S217,721,127的最后9位数。
# --hints--
`euler340()`应返回291504964。
```js
assert.strictEqual(euler340(), 291504964);
```
# --solutions--