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#include <iostream> #include <cstring> using namespace std; long long binom(long long n, long long k) { if(n < k) { swap(n, k); } long long a = 1; for(long long i = 1; i <= n; i++) { a *= i; } long long b = 1; for(long long i = 1; i <= k; i++) { b *= i; } long long c = 1; for(long long i = 1; i <= (n - k); i++) { c *= i; } return a / (b * c); } int main() { long long a,n,m,k; cin>>a>>n>>m>>k; long long ans=0; for(long long i = 0; i <= n; i++) { for(long long j = 0; j <= m; j++) { for(long long p = 0; p <= k; p++) { if(i >= p and j >= p and i + j - p <= a) { ans += binom(a, p) * binom(a - p, i - p) * binom(a - i, j - p); } } } } cout << ans << endl; return 0; }
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