// Main function, where the program will start.
int main() {
   int i,j,a,z,tmo,gpo,gpl,ttf93; // Useful variables.

   a = 0; // Clear a.

    // Iterate 10 turns
   for (i = 0; i < 10; i++) {
        P1 |= 1 << 3; // Set bit 3 of P1.
        for (j = 0; j < 500; j++) ; // Magic delay.
        P1 |= 1 << 4; // Set bit 4 of P1.
        for (j = 0; j < 500; j++) ; // One more magic delay.
        P1 &= ~((1 << 3) | (1 << 4)); // Clear bit 3 and 4 of P1.
        for (j = 0; j < 453; j++) ; // Yet more magic delay.
    }

    for (;;) ; // Infinite loop.
}