View Code of Problem 71

#include<stdio.h>
int main()
{
	int i;
	int n;
	scanf("%d",&n);
	int a1=2;
	int a2=3;
	int a4=1;
	int a5=2;
			double he=0.00;
	for(i=3;i<=n;i++)
	{
		int a3=a1+a2;
		a1=a2;
		a2=a3;
		int b3=a4+a5;
		a4=a5;
		a5=b3;
		he=he+1.0*a3/b3;
	}
						
	printf("%.2f\n",he+3.5);
	
	return 0 ;
}