#include
int grade(int score)
{
int level = -1;
if(score >=90 && score <=100)
level = 4;
else if(score >=80 && score <=89)
level = 3;
else if(score >=70 && score <=79)
level = 2;
else if(score >=60 && score <=69)
level = 1;
else if(score < 60)
level = 0;
return level;
}
int main()
{
int score;
scanf("%d", &score);
printf("level:%d\n", grade(score));
}