#include <stdint.h>
#include <stdio.h>
#include <math.h>
#include <inttypes.h>


int main(void) {
    uint64_t n;
    scanf("%" PRIu64, &n);
    uint64_t k = sqrtl(2 * n);
    if (k * (k + 1) / 2 == n) {
        printf("YES\n%" PRIu64 "\n", k);
    }
    else {
        printf("NO\n");
    }
    return 0;
}