#include "leetcode.h"

class Solution {
public:
  int countVowelStrings(int n) {
    int a = 1, e = 1, i = 1, o = 1, u = 1;
    while (--n) {
      o += u;
      i += o;
      e += i;
      a += e;
    }
    return a + e + i + o + u;
  }
};

int main() {
  Solution obj;
  cout << obj.countVowelStrings(1);
}