View Code of Problem 71

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