13 lines
202 B
C
13 lines
202 B
C
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#include <stdio.h>
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#define PI 3.1415927
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#define TQ(x) ((x)*(x)*(x))
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int main(void){
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double r = 0.0;
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while(scanf("%lf",&r) == 1){
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printf("%.3lf\n",(4.0/3.0)*PI*TQ(r));
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getchar();
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}
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return 0;
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}
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