#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>

int sum = 0;

void *compute(void *data) {
    int i;

    for (i = 0; i < 1000; i++) {
        sum++;
    }
}

int main() {
    int i, n;
    pthread_t *threads;

    scanf("%d", &n);
    threads = (pthread_t*) malloc(n * sizeof(pthread_t));

    for (i = 0; i < n; i++) {
        pthread_create(&threads[i], NULL, compute, NULL);
    }

    for (i = 0; i < n; i++) {
        pthread_join(threads[i], NULL);
    }

    printf("%d\n", sum);

    free(threads);
    return 0;
}