#include<stdio.h>
 int main()
 {
int age(int n);
 printf("no.5,age:%d\n",age(5));
 return 0;
 }
 int age(int n)
 {
 int c;
 if(n==1)
 c=10;
 else
 c=age(n-1)+2;
 return c;
 }
 /*
 2+age[4]
 2+2+age[3]
 2+2+2+age[2]
 2+2+2+2+age[1]
 2+2+2+2+10=18;
 */