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10 lines
187 B
C++
10 lines
187 B
C++
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#include<cstdio>
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int main(){
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int a,e,f,c,b;
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while(~scanf("%d%d%d",&e,&f,&c)){
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for(a=e+f,b=0;a>=c;a=a%c+a/c)
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b+=a/c;
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printf("%d\n",b);
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}
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}
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