#include <REGX52.H>
#define LED1 P1_5
#define LED2 P1_4
#define LED3 P1_3

void delay(unsigned int count) {
    unsigned int x, y;
    for (x = 0; x < count; x++)
        for (y = 0; y < 1275; y++);
}

void main(void) {
    while (1) {
        LED1 = 0; LED2 = 1; LED3 = 0;
        delay(50);
        LED1 = 1; LED2 = 0; LED3 = 0;
        delay(50);
    }
}
