View Code of Problem 71

#include<cstdio>
#include<cstdlib>
#include<cmath>
#include<iostream>
#include<algorithm>
using namespace std;
int main(){
      float a=2,b=1,sum=2;
	  int n;
	  scanf("%d",&n);
	  for(int i=1;i<n;i++)
	  {
			float t=a;
			float v=b;
			a=a+b;
			b=t;
			sum+=a/b;
	  }
	  printf("%.2f\n",sum);
	return 0;

}

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