View Code of Problem 71

#include <stdio.h>
  
int main(){
  int n,i;
  scanf("%d", &n);
  float sum=0, son=2, mother=1, temp;
  for (i=0;i<n;i++){
    sum += son/mother;
    temp = son;
    son = mother + temp;
    mother = temp;
  }
  printf("%.2f", sum);
  }