Grading system for school with C

#include <stdio.h>

int main() 
{
  int score ;

    printf("Please enter your score:\n");

    scanf("%d", &score);

    if (score >= 80 && score <= 100)
    {
        printf("Your score is %i grade A", score);
    }
    else if (score >= 70 && score <= 79)
    {
        printf("Your score is %i grade B", score);
    }
    else if (score >= 65 && score <= 69)
    {
        printf("Your score is %i grade C", score);
    }
    else if (score >= 60 && score <= 64)
    {
        printf("Your score is %i grade D", score);
    }
    else if (score >= 50 && score <= 59)
    {
        printf("Your score is %i grade E", score);
    }
    else if ( score <= 49 && score >= 0)
    {
        printf("Your score is %i grade F", score);
    }
    else
    {
        printf("you entered invalid score");
    }

    return 0;
}