Hello World

简单测试一下

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$\LaTeX$
$E=mc^2$

$$\binom{n}{m} = \frac{n!}{m!(n-m)!}$$ $$\sum_{i=1}^n \frac{1}{n}$$

#include<bits/stdc++.h>

int main() {
}

n = eval(input())
print(n)