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

/// <summary>
/// 入力された数字を返す
/// </summary>
/// <returns></returns>
uint64_t ReadNum() {
	int negate = 0;
	char c = getchar();
	uint64_t num = 0;
	int numCnt = 0;
	while (c != '\n') {
		if (c == '-') {
			negate = 1;
		}
		else {
			num = num * 10 + c - '0';
		}

		c = getchar();
	}
	if (negate == 1) {
		num *= -1;
	}
	return num;
}

int main(void) {
	uint64_t n = ReadNum();
	uint64_t sec = 0;
	uint64_t a = 0;
	for (int i = 1; i <= n; i++) {
		a += i;
		sec++;
		if (a == n) {
			printf("YES\n%lld", sec);
			break;
		}
		if (a >= n) {
			printf("NO");
			break;
		}
	}
}