> #include<stdio.h>
> int  main()
> {
> 	int i,n,k;
> 	long float sum;
> 	printf("Cards  Overhang\n");
> 	while(scanf("%d",&n)!=EOF){
> 		k=2;
> 		for(i=1,sum=0;i<=n;i++){
> 			sum+=1.0/k;
> 			k+=2;
> 		}
> 		printf("%5d",n);
> 		printf(" %9.3f\n",sum);
> 	}
> }