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// 1621. Distinct Numbers
#include <bits/stdc++.h>
using namespace std;
int main() {
static int n, x;
set<int> s;
scanf("%d", &n);
for (int i = 0; i < n; i++) {
scanf("%d", &x);
s.insert(x);
}
printf("%d\n", (int)s.size());
}
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