#include <stdio.h>

int main(void){
    /* dayL 日付の10の位、dayR 日付の1の位 */
    int month, day, dayL, dayR, count;
    count = 0;
    for (month = 1; month <= 12; month++) {
        for (day = 1; day <= 31; day++) {
            /* 2015年は、うるう年ではない */
            if (month == 2 && day >= 29) { continue; }
            if (month == 4 && day == 31) { continue; }
            if (month == 6 && day == 31) { continue; }
            if (month == 9 && day == 31) { continue; }
            if (month == 11 && day == 31) { continue; }
            
            if (10 <= day && day < 20) {
                dayR = day - 10;
                dayL = (day - dayR) / 10;
            }
            else if (20 <= day && day < 30) {
                dayR = day - 20;
                dayL = (day - dayR) / 10;
            }
            else if (day == 30 || day == 31) {
                dayR = day - 30;
                dayL = (day - dayR) / 10;
            } else {
                dayR = day;
                dayL = 0;
            }
            
            if (month == dayR + dayL) {
                count++;
            }
        }
    }
    printf("%d\n", count);

    return 0;
}