Problem reading a C string

Question

I would like to know why my programme does not accept reading the name of the second and third students at all. I’ve already used the buffer clean command, which is fflush(stdin) and he hasn’t done the same. Keep ignoring the name and reading only the code and the student’s 3 notes.

struct alunos a[3];
int i, j;

for (i = 0; i < 3; i++){
    printf("Digite o nome do funcionario : ");
    gets(a[i].nome);
    fflush(stdin);

    printf("Digite o codigo do aluno : ");
    scanf("%d",&a[i].codigo);

    for (j = 0; j < 3; j++){
        printf("Digite a %d nota : ",j+1);
        scanf("%f",&a[i].notas[j]);
    }

    printf("\n");

}