[BOJ] 17614 369

#include <stdio.h>
#include <string.h>

int main(void) {
    int maxTurn = 0;
    int total_claps = 0;
    int i;
    scanf("%d", &maxTurn);

    while (i <= maxTurn) {
        int current_number = i;
        while (current_number > 0) {
            int digit = current_number % 10;
            if (digit == 3 || digit == 6 || digit == 9) {
                total_claps++;
            }
            current_number /= 10;
        }
        i++;
    }

    printf("%d", total_claps);
}