28 lines
513 B
C++
28 lines
513 B
C++
#include<iostream>
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using namespace std;
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int n,i,j,a[15],b[15],l=15;
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int main()
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{
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cin>>n; b[1]=6;
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for(i=4; i<=n; i++)
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{
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a[1]=i%100000%10000%1000%100%10;
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a[2]=i%100000%10000%1000%100/10;
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a[3]=i%100000%10000%1000/100;
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a[4]=i%100000%10000/1000;
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a[5]=i%100000/10000;
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a[6]=i/100000;
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for(j=1; j<=l; j++)
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{
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b[j]=b[j]+a[j];
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if(b[j]>9)
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{
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b[j]=b[j]%10;
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b[j+1]=b[j+1]+1;
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}
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}
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}
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while((l>1)&&(b[l]==0)) l--;
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for(i=l; i>=1; i--) cout<<b[i];
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}
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