#include<LiquidCrystal.h>
#define RS 9
#define EN 8
#define D4 7
#define D5 6
#define D6 5
#define D7 4
#define rank0 29
#define rank1 27
#define rank2 25
#define rank3 23
#define MathAlgo 31

bool CRank0;
bool CRank1;
bool CRank2;
bool CRank3;


LiquidCrystal lcd(RS,EN,D4,D5,D6,D7);

void setup(){
  lcd.begin(16,2);
  lcd.setCursor(4,0);
  lcd.print("Welcome.");
  pinMode(rank0, OUTPUT);
  pinMode(rank1, OUTPUT);
  pinMode(rank2, OUTPUT);
  pinMode(rank3, OUTPUT);
  pinMode(MathAlgo, OUTPUT);
  delay(3000);
  lcd.clear();
  lcd.setCursor(0,0);
}

void loop(){
  CRank0 = digitalRead(rank0);
  if(CRank0){
    lcd.print("1");
  }
}