o que eu fiz errado agr?

#include <stdio.h>
#include <stdlib.h>

main()
{

	float n1, n2, n3, n4, media;
	printf("Digite a nota do primeiro bimestre");
	scanf("%f", n1);
	printf("Digite a nota do segundo bimestre");
	scanf("%f", n2);
	printf("Digite a nota do terceiro bimestre");
	scanf("%f", n3);
	printf("Digite a nota do quarto bimestre");
	scanf("%f", n4);

	media = (n1 + n2 + n3 + n4)/4;
	printf("Sua media e:%f\n", media);
	if (media >= 6);
		printf ("*BOA*\n");
//Re:Zero Kara Hajimeru Isekai Seikatsu Opening
		printf ("https://www.youtube.com/watch?v=tUC578VmldU");
	if (media < 6);
		printf("Reprovado, pondere o suborno\n");
//Sakamoto Desu Ga Ending
		printf("https://www.youtube.com/watch?v=guZ4hNyRmG4");
	printf ("Cabo");
}