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#include <iostream> #include <cstring> using namespace std; typedef long long ll; const int maxn = 105; const double EPS = 1e-7; int n; ll dp[100]; ll rec(int at) { if(at >= n) { return 1; } if(dp[at] != -1) { return dp[at]; } ll res = 0; res += rec(at + 1); for(int j = at + 3; j <= n; j++) { res += rec(j + 1); } return dp[at] = res; } int main() { ios_base::sync_with_stdio(false); cin >> n; memset(dp, -1, sizeof dp); cout << rec(0) << endl; return 0; }
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