Problem F: 输出数列1, -2, 3, -4, 5, -6...

Problem F: 输出数列1, -2, 3, -4, 5, -6...

Time Limit: 1 Sec  Memory Limit: 128 MB
Submit: 1277  Solved: 1079
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Description

输入正整数N（N≤100），输出数列中的前N项。每个数占4个位置 

Sample Input Copy 

5

Sample Output Copy 

   1  -2   3  -4   5
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