int B=3,R=5,G=6;
void setup(){
Serial.begin(9600);
}
void loop(){
Serial.println("what is the mark ,it should be between 0 and 20");
while(Serial.available()==0){};
int t=Serial.parseInt();
t=map(t,0,20,0,100);
t=constrain(t,0,100);
Serial.print("your mark in other scale is ");
Serial.print(t);
Serial.println("");
Serial.println("what is the number of randoms?");
while(Serial.available()==0){delay(10000);}
int x=Serial.parseInt();
int s[x];
for(int i=0;i<x;i++){
  s[i]=random(70,100);
  Serial.println(s[i]);
}
}