pc9

#include <stdio.h>

int main(void) {
  const double AVAILABLE_RONS = 20;
  const double APPLES_KG_PRICE = 5;
  const double PEARS_KG_PRICE = 7;

  double x, y;
  printf("x="); scanf("%lf", &x);
  printf("y="); scanf("%lf", &y);

  if (x * APPLES_KG_PRICE + y * PEARS_KG_PRICE <= AVAILABLE_RONS) {
    puts("YES");
  } else {
    puts("NO");
  }

  return 0;
}