#include <stdio.h>

#define INIT	316
#define ADD		 52

int main(void)
{
	unsigned long long n;
	unsigned long long total = INIT;
	unsigned long long i;

	scanf("%llu", &n);

	for (i = 1; i < n; i++) {
		total += ADD;
	}
	printf("%llu\n", total);

	return 0;
}