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#include <iostream> #include <vector> #include <queue> #include <cmath> using namespace std; const int maxn = 100; int dp[maxn]; int fib(int n) { if(n == 1 or n == 2) { return 1; } if(dp[n] != -1) { return dp[n]; } return dp[n] = fib(n - 1) + fib(n - 2); } int main() { for(int i = 0; i < maxn; i++) { dp[i] = -1; } int n; cin >> n; cout << fib(n) << endl; return 0; } // fib(4) = fib(3) + fib(2) = 2 + 1 = 3 // fib(3) = fib(2) + fib(1) = 1 + 1 = 2 // fib(2) = 1 // fib(1) = 1 // fib(2) = 1
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