#include int main() { int m,n; double s,y,i,j,k; while(scanf("%d",&m)!=EOF) { for(i=0;i<m;i++) {s=0.0; k=1; scanf("%d",&n); for(j=1;j<=n;j++) { y=k/j; s+=y; k=-k; } printf("%.2lf\n",s); } } return 0; }