function birthday(s, d, m) {
   let count= 0;
   for(let i= 0; i<s.length; i++){
      let slice= s.slice(i, i+m);
      let addedSlice= slice.reduce( (acc, curr) => {
         return acc + curr}, 0);
      
      if(addedSlice == d){
         count += 1;
         if((i+1+m) > s.length)
            break;
      };
   };
   return count;
};