#include <bits/stdc++.h> 
int countDistinctWays(long long nStairs) {
    //  Write your code here.
    //Base case 
    if(nStairs<0) return 0;
    if(nStairs==0) return 1;
    int ans=countDistinctWays(nStairs-1) + countDistinctWays(nStairs-2);
    return ans;
}