#include <stdio.h>

int get_char(char *s) {
    *s = getchar();
    return *s != EOF && *s != '\n' && *s != '\r';
}

int main() {
    char c;
    int count = 0;
    while (get_char(&c)) {
        if (c == ' ') {
            count++;
        }
    }
    printf("%d\n", count);
    return 0;
}