int main()
{
	int m,n,i,j;	//??m????n????????i?j
	float s;	//????b??s
	float a[10000];	//????????a[n]????int????????????a[i+1]/a[i]????float??????a[n]?float?
	float b[10000];	//???????????b[n]
	float c[10000];
	a[0]=1,a[1]=1;	//?????1
	cin>>m;
	for(j=1;j<=m;j++)	//??m??????
		{	s=0;
			cin>>n;		//?????????n
			for(i=2;i<=(n+1);i++)	//????a?b???
				a[i]=a[i-1]+a[i-2];	//????
			for(i=1;i<=n;i++)	
			b[i]=a[i+1]/a[i];
			for(i=1;i<=n;i++)	//??b[n]??
				s=s+b[i];
			c[j]=s;
		}
	for(j=1;j<=m;j++)	
	printf("%.3f\n",c[j]);
	return 0;
}