#include <stdio.h>

int x = 4;
int func(int x){
    x += 3;
    return x;
}

int read_x(void){
    return x;
}

int main(void){
    int x = 2;
    int y = func(x);

    printf("%d\n", y);
    printf("%d\n", x);
    printf("%d\n", read_x());

    return 0;
}