20 lines
242 B
C++
20 lines
242 B
C++
#include<cstdio>
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int main()
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{
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#ifdef local
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freopen("pro.in","r",stdin);
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#endif
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int L,R,res=0; scanf("%d%d",&L,&R);
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for(int i=L;i<=R;i++)
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{
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int x=i;
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while(x)
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{
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if(x%10==2) res++;
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x/=10;
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}
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}
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printf("%d\n",res);
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return 0;
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}
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