#include <cstdio>

int main(){
    int month[12] = {31,28,31,30,31,30,31,31,30,31,30,31};
    int cnt = 0;
    for(int i=1;i <= 12;i++){
        for(int j=1;j <= month[i-1];j++)
            if(i == (j % 10) + (j - j % 10) / 10)
                cnt++;
    }
    printf("%d\n",cnt);
    return 0;
}