#include <stdio.h>

int main() {
    int n = 20;
    int i;
    long P = 1;

    for(i=1; i<=n; i=i+1) {
        printf("---------\n");
        printf("P = %ld\n", P);
        printf("i = %d\n", i);
        P = P * i;
        printf("P = P * i = %ld\n", P);
    }
}

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