18 lines
171 B
C
18 lines
171 B
C
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#include<stdio.h>
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#include<math.h>
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int main(){
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int n,a=0,sum=0;
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scanf("%d",&n);
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for(int i=1;i<=n;i++){
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a=a*10+i;
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sum+=a;
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}
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printf("%d",sum);
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return 0;
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}
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