Hello world!
Hello world!
Hello world!

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#include <iostream>
#include <cstdio>
#include <cstring>
#include <algorithm>
using namespace std;
int main(void)
{
    int a,b;
    scanf("%d%d",&a,&b);
    printf("%d\n",a+b);
    return 0;
}

$$
\frac{\partial u}{\partial t} = h^2 \left( \frac{\partial^2 u}{\partial x^2} + \frac{\partial^2 u}{\partial y^2} + \frac{\partial^2 u}{\partial z^2}\right)
$$