#include <stdio.h>

int main() {
  int N, P, Q, total;
  char C;

  //scanf("%d", &N);
  //scanf("%d %c %d", &P, &C, &Q);
  scanf("%d%d %c %d", &N, &P, &C, &Q);
  
  if (C == '+') {
    total = P + Q;
  } else {
  	total = P * Q;
  }

  if (total > N) {
    printf("OVERFLOW\n");
  } else {
  	printf("OK\n");
  }

  return 0;
}