#include<stdio.h>

bool exist(int m,int d){
    int days[12]={31,28,31,30,31,30,31,31,30,31,30,31};
    m--;
    if(d>days[m] || d<0){
        return false;
    }else{
        return true;
    }
}

int main(void){
    int i,j,day,ans=0;
    for(i=1; i<32; i++){
        j = i/10+1%10;
        if(exist(j,i)){
            ans++;
        }
    }
    printf("%d\n",ans);
    return 0;
}