Having two buckets with tanks of 7 l and 4 l how it is possible to gain 5 l of water from the river? Please it is urgent

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To gather in four liter (we will allow a bucket) waters. To pour from 4 liter buckets in seven liter bucket in seven a liter bucket awakes with 4 l to gather again in four liter bucket of water and again to pour water in seven liter bucket in seven a liter bucket awakes with 7 l and in four litiovy 1 l to pour out all water of seven liter buckets and to peredit from four a liter bucket of 1 letters in seven liter bucket then sny to gather waters in the 4th liter bucket and were rotted water in seven liter vedto as at us in seven a liter bucket was already 1 letters and we added 4 more liters in seven a liter bucket there were 5 liters of votr.1) 4+4+4=12(l) - is gathered by a bucket of 4 l 2) 12-7=5(l) - are poured out by a bucket of 7 l of ILI 4*3-7=5 12-7=5 5=5 - right equality
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Answer add