for(j=1;k[j-1][0]!=-1;j++){ 
   i=(int)(ceil(PI/100*pow((k[j-1][0] <= k[j-1][1]?k[j-1][1]:k[j-1][0]),2))); 
   printf("Property %d: This property will begin eroding in year %d.\n",j,i); 
}