finding a cell and placing it on another sheet

Could someone please help
I have on sheet 2 in column D names of cities the vary like Sydney
Brisbane could be twice but each week the cells could have difference
city in them.
In column F it will have a number in them a difference number each
week
I need the total of the number that matches the city added up on sheet
1 that matches the city in sheet 1 which on sheet one the city never
moves