View Code of Problem 48

#include<cstdio>
#include<cstdlib>
#include<cmath>
#include<cstring>
#include<iostream>
using namespace std;
int main(){
   float a=2.0,b=1.0;
   float sum=2.0;
   int n;
   scanf("%d",&n);
   for(int i=1;i<n;i++){
   	  int t=a;
   	  int m=b;
   	  a=a+b;
   	  b=t;
   	  sum+=a/b;
   }
   printf("%.6f\n",sum);


	return 0;
}

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