public static void main(String[] args) {
int[] grades = {120, 100, 77};
if (grades[0] > 0 && grades[0] < 150
&& grades[1] > 0 && grades[1] < 110
&& grades[2] > 0 && grades[2] < 100){
System.out.println(Arrays.stream(grades).sum());
}else{
throw new RuntimeException();
}
}