#include <iostream>
using namespace std;
int main() {
    int score;
    double grade;
    cout << "Enter your score (0-100): ";
    cin >> score;
    if (score >= 0 && score <= 49) {
        grade = 0;
    } else if (score >= 50 && score <= 54) {
        grade = 1;
    } else if (score >= 55 && score <= 59) {
        grade = 1.5;
    } else if (score >= 60 && score <= 64) {
        grade = 2;
    } else if (score >= 65 && score <= 69) {
        grade = 2.5;
    } else if (score >= 70 && score <= 74) {
        grade = 3;
    } else if (score >= 75 && score <= 79) {
        grade = 3.5;
    } else if (score >= 80 && score <= 100) {
        grade = 4;
    } else {
        cout << "Invalid score!" << endl;
        return 0;
    }
    cout << "Your grade is: " << grade << endl;
    return 0;
}

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