Number of days in a month Program

Number of days in a month  - 

#include<stdio.h>
int main ()

{
    int a;
    printf("Enter month ");
    scanf("%d",&a);
    if (a==1 || a==3 || a==5 || a==7 || a==8 || a==10 || a==12)
    printf("31 days");
    else if (a==2)
    printf("28 days");
    else
    printf("30 days");

    return 0;
}

Output -

Enter month 5
31 days