22 lines
308 B
C++
22 lines
308 B
C++
#include<cstdio>
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#include<cmath>
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int n,m;
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double res,pos;
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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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while(scanf("%d%d",&n,&m)==2)
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{
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res=0;
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for(int i=1;i<n;i++)
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{
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pos=(double)i/n*(n+m);
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res+=fabs(pos-floor(pos+0.5))/(n+m);
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}
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printf("%.4lf\n",res*10000);
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}
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return 0;
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}
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