View Code of Problem 71

#include<stdio.h>
int main(){
	
	double a=2,sum=0,b=1,c,t;
	
	int s;
	scanf("%d",&s);
	for(int i=0;i<s;i++){
		sum+=a/b;
		t=a;
		a=t+b;
		b=t;
		
	}
	printf("%.2lf",sum);
	return 0;
} 

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