#include <stdio.h>
#include <limits.h>


int parse(char* ptr, int* i) {
	int value = 0;
	for (; ptr[*i] <= '9' && ptr[*i] >= '0'; ++(*i))
		value = value * 10 + ptr[*i] - '0';
	return value;
}

int find_max(char* a) {
	int i = 0;
	int max = INT_MIN,
		curr = INT_MIN;
	while (a[i]) {
		if (a[i] == '-' && a[i + 1] <= '9' && a[i + 1] >= '0') {
			i++;
			curr = -parse(a, &i);
			if (curr > max)
				max = curr;
			i++;
		}
		else if (a[i + 1] <= '9' && a[i + 1] >= '0') {
			curr = parse(a, &i);
			if (curr > max)
				max = curr;

		}
		else
			i++;

	}
	return max;
}

int main() {
	char a[] = "- --privet   -13 -257 -300";
	printf("%d\n", find_max(a));
	return 0;
}