View Code of Problem 48

#include<stdio.h>
int main(){
	int m,up=2,down=1;
	double sum=0;
	int n;
	int i;
	scanf("%d",&n);
	for(i=0;i<n;i++){
		sum=sum+(up*1.0)/(down*1.0);
		m=up;
		up=down+up;
		down=m;	
	}
	printf("%.6f",sum);
	return 0;
}