#include <stdio.h>
#include <string.h>

int main(void)
{
	char s[20];
	int num, index;
	scanf("%s", s);
	index = 0;
	num = 0;
	while (s[index] != 0) {
		char c;
		int num2 = num * 10;
		c = s[index];
		num = num2 + (c - '0');
		index++;
	}
	printf("%d\n", num);
	return 0;
}