#include "biscuits.h"
#include <bits/stdc++.h>
using i64 = long long;
long long count_tastiness(long long x, std::vector<long long> a) {
int k = a.size();
auto f = [&](auto self, int i, i64 n) -> i64 {
i64 cur = n;
if (i < k) {
cur += a[i];
}
if (cur == 0) {
return 1;
}
i64 res = self(self, i + 1, cur / 2);
if (cur >= x) {
res += self(self, i + 1, (cur - x) / 2);
}
return res;
};
return f(f, 0, 0);
}
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