public static void main(String[] args) {

// TODO Auto-generated method stub

// sum();

sum1();

}

private static void sum1() {

// TODO Auto-generated method stub

int sum = 0;

int m = 20;

int n = 100;

boolean b =true;

while (b) {

if (n>=m) {

sum +=m;

m++;

b=true;

}else {

b=false;

}

}

System.out.println(sum);

}