text: #include <stdio.h>
  
  int sumn(int n);
  int fib(int n);
  int main(void)
  {
  	printf("%d\n", sumn(100));
  
  	for (int i = 1; i <= 20; i++)
  		printf("%d ", fib(i));
  	printf("\n");
  
  	return 0;
  }
  
  int sumn(int n)
  {
  	if (n == 0)
  		return 0;
  
  	return n + sumn(n-1);
  }
  
  int fib(int n)
  {
  	if (n == 1 || n == 2)
  		return 1;
  	return fib(n-1) + fib(n-2);
  }
  
  