#include <stdio.h>

int main() {
    b_();
    return 0;
}

int cc_(n){
    if(n>1)
        n=cc_()
}

int c_() {
    int a;
    int n=1;
    scanf("%d", &a);
    
    printf("%d", n);

    return 0;
}

int b_() {
    int a;
    int n=1;
    scanf("%d", &a);
    if(a<1){
        printf("1");
        return 0;
    }
    for(int i=1; i<=a; i++){
        n*=i;
    }
    printf("%d", n);

    return 0;
}

int a_() {
    int a[3], b;
    scanf("%d %d %d", &a[0], &a[1], &a[2]);
    if(a[0] < a[1]){
        b=a[0];
        a[0]=a[1];
        a[1]=b;
    }
    if(a[0] < a[2]){
        b=a[0];
        a[0]=a[2];
        a[2]=b;
    }
    if(a[1] < a[2]){
        b=a[1];
        a[1]=a[2];
        a[2]=b;
    }

    printf("%d %d %d", a[0], a[1], a[2]);
    return 0;
}

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