What is the out put of c code?

Question

#include<stdio.h>
int main()
{
int a=3;
int b=++a+a+++--a;
printf("value of b is %d",b);
return (b);
}

Answer is 13 ,how tell me plz

Answer 1

13

Answer 2

++a(4)+a++(9)+--a(13)