ERN LNK 2019 - How to solve?

I'm having a problem with Visual Studio 2017.

This appears when I'm going to compile:

  

LNK2019 undefined external symbol _WinMain @ 16 referenced in function "int __cdecl invoke_main (void)" (? invoke_main @@ YAHXZ) Win32Project2

That was the code I wrote, simple just to start and test if everything was ok.

#include<stdio.h>

int main()
{

    int n = 0;


    scanf_s("%d", &n);

    return 0;
}