14 lines
243 B
C
14 lines
243 B
C
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#include <stdio.h>
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int numbersum(int i, int p) {
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int n = p/i;
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return i*n*(n+1)/2;
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}
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int main( int argc, char *argv[] ) {
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int n = 999;
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int s = numbersum(3,n) + numbersum(5,n) - numbersum(15,n);
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printf("%d\n",s);
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return 0;
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}
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