Does *&s1 refer to the first member of structure variable s1

Does the expression *(int *)&s1 below inside the printf() statement
guarantee to refer to the first member of the structure variable s1?
I've tried the code and it seems that it works that way. The C
standard states this? Thank you very much.

#include <stdio.h>

struct S{
int m1, m2, m3;
};

int main(void)
{
struct S s1 = {3, 4, 5};
printf("%d\n", *(int *)&s1);
return 0;
}

/*
$ gcc -ansi -pedantic -W -Wall a.c
$ ./a.exe

3

$
*/

.

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