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#include <bits/stdc++.h>
using namespace std;
int main() {
int n, i;
cin >> n;
int a[100] = {0};
for (i = 0;; ++i) {
//需要注意下面两句话的位置关系
a[i] = n % 2;
if (n / 2 > 0) {
n /= 2;
} else {
break;
}
}
//倒序输出
for (; i >= 0; i--) {
cout << a[i];
}
return 0;
}