Problem:
Score : 100 points

Problem Statement

Takahashi, who is A years old, is riding a Ferris wheel.

It costs B yen (B is an even number) to ride the Ferris wheel if you are 13 years old or older, but children between 6 and 12 years old (inclusive) can ride it for half the cost, and children who are 5 years old or younger are free of charge. (Yen is the currency of Japan.)

Find the cost of the Ferris wheel for Takahashi.

Constraints

0 ≤ A ≤ 100

2 ≤ B ≤ 1000

B is an even number.

Input

Input is given from Standard Input in the following format:

A B

Output

Print the cost of the Ferris wheel for Takahashi.

Sample Input 1

30 100

Sample Output 1

100

Takahashi is 30 years old now, and the cost of the Ferris wheel is 100 yen.

Sample Input 2

12 100

Sample Output 2

50

Takahashi is 12 years old, and the cost of the Ferris wheel is the half of 100 yen, that is, 50 yen.

Sample Input 3

0 100

Sample Output 3

0

Takahashi is 0 years old, and he can ride the Ferris wheel for free.

Solution in C (GCC 5.4.1) (judge verdict: Wrong Answer)

#include<stdio.h>
#include <stdlib.h>
typedef struct{
    int b;
    int c;
}t;
int cmp1(const void *a,const void *b){return *(int*)b-*(int*)a;}
int cmp2(const void *x,const void *y){return ((t*)y)->c-((t*)x)->c;}
int main(){
    int n,m,i,j=0,k,a[100000],l;
    long r=0;
    t z[100000];
    scanf("%d%d",&n,&m);
    for(i=0;i<n;i++)scanf("%d",&a[i]);
    for(i=0;i<m;i++)scanf("%d%d",&z[i].b,&z[i].c);
    qsort(a,n,4,cmp1);//for(i=0;i<n;i++)printf("%d,",a[i]);printf("\n");
    qsort(z,m,8,cmp2);
    for(i=0;i<m;i++){
        //printf("%d,%d\n",z[i].b,z[i].c);
        while(z[i].c<a[j])j++;
        l=j;
        for(k=l;k<l+z[i].b;k++){
            if(k<n){
                //printf("%d,%d\n",a[k],z[i].c);
                a[k]=z[i].c;
                j++;
            }
            else break;
        }
    }
    for(i=n;i--;)r+=a[i];
    printf("%ld",r);
    return 0;
}