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#include <stdio.h>
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int ggT(int a, int b) {
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if(a==0) return b;
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while(b!=0) {
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if(a > b) a -= b;
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else b -= a;
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}
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return a;
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}
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int main( int argc, char *argv[] ) {
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int n = 1;
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for(int i = 20; i > 1; i--) {
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if(n%i!=0) n*=i/ggT(i,n);
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}
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printf("%d\n",n);
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return 0;
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}
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