25 lines
378 B
Python
25 lines
378 B
Python
import sys
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input=sys.stdin.readline
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x,y,tw,ts=map(int,input().rstrip().split())
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tw2=tw*2
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ts2=ts*2
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sum=0
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minxy=min(x,y)
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if minxy>0:
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sum+=(min(ts,tw2)*minxy)
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x-=minxy
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y-=minxy
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maxxy=max(x,y)
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if maxxy>0:
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if (maxxy%2)==0:
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sum+=(min(ts2,tw2)*int(maxxy/2))
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elif maxxy>2:
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sum+=(min(ts2,tw2)*int(maxxy/2)+tw)
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else:
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sum+=tw
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print(sum)
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