#include <stdio.h>
#include <stdbool.h>
#include <math.h>

bool checkPerfectNumber(int num) {
    if (num <= 1) {
        return false;
    }
    
    int divisorSum = 1; // 1 is always a divisor
    
    for (int i = 2; i * i <= num; i++) {
        if (num % i == 0) {
            divisorSum += i;
            // Add the paired divisor if it's different
            if (i * i != num) {
                divisorSum += num / i;
            }
        }
    }
    
    return divisorSum == num;
}

int main() {
    int num;
    scanf("%d", &num);
    printf("%s\n", checkPerfectNumber(num) ? "true" : "false");
    return 0;
}