no

/*#include <iostream>
#include <conio.h>
#include <math.h>
using namespace std;
float suma(float n, float a){
	float b,c,d,e;
	b=(pow((-1),(n+1)));
	c=(2*n-1)*(pow(a,pow(2,(n-1))));
	d=2*n;
	e=b*(c/d);
	return e;
}
float main(){
	float N,a;
	int a,b,c;
	while (1){
		cout<<"Ingrese N : "<<endl;
		cin>>N;
		if(N>=0&&N<=21)break;
	}
	while (2){
		cout<<"Ingrese a : "<<endl;
		cin>>a;
		if(a<0.5&&a>2)break;
	}
	a=0;
	b=1;
	do{
		a+=b;*/