#include <stdio.h>
 
int main() {
    int nilai;
    if (scanf("%d", &nilai
) != 1) return 0;  
    if (nilai 
>= 85 && nilai 
<= 100) printf("Nilai huruf: A\n");     else if (nilai 
>= 70 && nilai 
<= 84) printf("Nilai huruf: B\n");     else if (nilai 
>= 55 && nilai 
<= 69) printf("Nilai huruf: C\n");     else if (nilai 
>= 40 && nilai 
<= 54) printf("Nilai huruf: D\n");     else if (nilai 
>= 0 && nilai 
< 40) printf("Nilai huruf: E\n");     else printf("Nilai tidak valid\n");     return 0;
}
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