#include <stdio.h> int main (){ int a, b, s; scanf ("%d", &a, &b); if (a >= 0 && a <= 10000 && b >= 0 && b <= 9){ s = (a * 10 + b) / 19; } printf ("%d", s);

#include <stdio.h>
int main (){
	int a, b, s;
	scanf ("%d", &a, &b);
	if (a >= 0 && a <= 10000 && b >= 0 && b <= 9){
		s = (a * 10 + b) / 19;
	} 
	printf ("%d", s);
}