#include "stdio.h"#include "math.h"int main(void){	int num;		while(scanf("%d", &num) != EOF){		int i;				for(i=0; i<num; i++){		//循环次数 			int j;			int number;			double sum = 0;						scanf("%d", &number);			for(j=1; j<=number; j++){				sum += 1.0/j * pow(-1,j+1);					}			printf("%.2lf\n", sum);		}			}		return 0;}