5 Littre

Steps
1. Fill 5 Litre Jug first
2. Pour it to 3 Litre Jug, Then you have 2 litre of water in big one & 3 litre in small jug
3. Emply small jug & pour 2 litre to small jug
4. Again fill Big jug.
5. Pour water to small jug which already have 2 littre in it & You will fill littre in to It
     Finally you have 3 littre in small Jar & 4 Littre in Big Jar