#include <stdio.h>
int main(){
    float mb, gb, bill,ebill;

    printf("Enter used megabytes: ");
    scanf("%f", &mb);
    gb=mb/1024;

    if (gb<20){
        bill=(mb*0.95)+2000;
        printf("Total bill: %f", bill);
    }
    else
        {
            bill=(mb*0.95)+2000;
            ebill=bill-(bill*0.15);
    printf("Total bill = %f", ebill);
    }
return 0;
}