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#include <stdio.h>
#include <stdlib.h>
int
main(void)
{
int c;
FILE *fp = fopen("input", "r");
register int floor = 0;
for (register unsigned int i = 1; (c = fgetc(fp)) != EOF; i++) {
floor += (c == '(') ? 1 : -1;
#ifdef PART2
if (floor == -1) {
printf("%u\n", i);
return EXIT_SUCCESS;
}
#endif
}
fclose(fp);
printf("%d\n", floor);
return EXIT_SUCCESS;
}
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