My first C program

Subject: My first C program
#include<stdio.h>
#include<stdlib.h>
#include<unistd.h>
int main (void)
{
	for(int k=0;k<5;k++)
    {
    	for(int i=0;i<20;i++)
    	{
    		    usleep(200000-k*50000);
		    system("clear");
		    printf("\n");printf("\n");
		    printf("8");for(int j=0;j<i;j++){printf("=");}printf("o");for(int j=i+1;j<20;    j++){printf("=");}printf("D\n");
	    }
	    for(int i=0;i<20;i++)
	    {
		    usleep(200000-k*40000);
		    system("clear");
		    printf("\n");printf("\n");
		    printf("8");for(int j=i+1;j<20;j++){printf("=");}printf("o");for(int j=0;j<i;j++){printf("=");}printf("D\n");
	    }
    }
    usleep(200000);
    printf("\n");
    system("clear");
    printf("8");for(int j=0;j<20;j++){printf("=");}printf("D- _ \n");
    usleep(200000);
    printf(" ");for(int j=0;j<20;j++){printf(" ");}printf("    _  _  _ \n");
    usleep(200000);
    printf(" ");for(int j=0;j<20;j++){printf(" ");}printf("       _   _   _ \n");
    usleep(200000);
    system("clear");
}