uri 2342

#include <stdio.h>
int main()
{
    int c,a,b,op,sum=0;
    scanf("%d",&c);
    scanf("%d %c %d",&a,&op,&b);

    switch(op)
    {
    {case'+':
        sum+=a+b;
        break;}
    {case'*':
        sum+=a*b;
        break;}
    }
        if(sum<=c)
        printf("OK\n");
        else
        printf("OVERFLOW\n");

        return 0;

}