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B.txt
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B.txt
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import java.util.Scanner;
public class B {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
int n = in.nextInt();
int k = in.nextInt();
int fours = n;
int twos = 2 * n;
int ones = 4 * n;
boolean ok = true;
for (int i = 0; i < k; i++) {
int a = in.nextInt();
while (a > 0 && ok) {
if (a >= 4 && fours > 0) {
fours -= 1;
ones -= 2;
a -= 4;
continue;
}
if (fours > 0) {
if (a == 3) {
fours -= 1;
ones -= 2;
a -= 3;
continue;
}
if (twos > 0) {
twos -= 1;
ones -= 1;
a -= 2;
continue;
}
if (a == 2) {
fours -= 1;
ones -= 2;
a -= 4;
continue;
} else {
fours -= 1;
ones -= 1;
twos += 1;
a -= 4;
continue;
}
}
if (twos > 0) {
twos -= 1;
ones -= 1;
a -= 2;
continue;
}
if (a == 1 && ones > 0) {
ones -= 1;
a -= 1;
continue;
}
ok = false;
}
}
if (ok) {
System.out.println("YES");
} else {
System.out.println("NO");
}
}
}