#include int main(void) { char str[10010]; int length,des; scanf ("%d %d",&length,&des); scanf ("%s",&str); int right,left; int vec; int answer; right=0; left=0; if (str[des-1] == '(') { for (int i = des-1; i < length; i++) { if ( str[i] == '('){ right++ ; }else{ left++ ; } if (right==left) { answer=i+1; break; } } } else { for (int i = des-1; i >= 0; i--) { if ( str[i] == '('){ right++ ; }else{ left++ ; } if (right==left) { answer=i+1; break; } } } printf("%d\n",answer); }